Tools Bench.

Product launches and open-source repos with enough signal to earn a second look.

Last Brew Time: Jun 27, 2026, 7:30 AM PT

Insight

Builders have stopped shipping new agents and are racing to wrap the few that already won, bolting a config layer onto Claude Code

01.AGENT RULEBOOKS AND SPECS

02.MEMORY AND MODEL ROUTING

03.ONE-COMMAND BUILD SCAFFOLDS

04.OPEN GENERATIVE DEMOS

Featured

GitHub179.5K

anomalyco/opencode

The open source coding agent.

youtube
Opencode Is Probably The Best Coding Agent I've Ever Used

Market Signal

Why It Has Market Pull

opencode is the most-starred open-source terminal coding agent in the world, built by the SST/Anomaly team (YC 2021). It pairs massive GitHub and user traction with a credible, funded company and a genuinely differentiated provider-agnostic model, exactly the kind of AI builder tool worth testing.

  • ~179k GitHub stars, ahead of Claude Code and Codex CLI as an open-source agent
  • Reported ~8M monthly active users; team projecting ~$25M annual revenue (June 2026)
  • Built by SST/Anomaly (YC 2021, backers incl. founders of PayPal/LinkedIn/YouTube); raised an undisclosed follow-on round
  • Hit #1 on Hacker News (~1,099 points, 546 comments) on launch
  • Provider-agnostic (Claude, OpenAI, Google, local models) with build/plan agents and a TUI-first design

feedbacks

What People Are Saying

  • "Finally a real open-source alternative that lets you switch models without switching tools."HN comment

  • "It's become my main workhorse coding agent."HN comment

  • "The TUI is genuinely the nicest of any terminal agent I've tried."Reddit r/programming

  • "Often uses 1GB of RAM or more, for a TUI."HN comment

  • "Release cadence is so fast that features break between versions."HN comment

  • "It was sending prompts to a third-party free tier by default until I caught it with mitmproxy."HN comment

  • "Being able to audit it is exactly why open source matters here."HN comment

GitHub117.0K

garrytan/gstack

Use Garry Tan's exact Claude Code setup: 23 opinionated tools that serve as CEO, Designer, Eng Manager, Release Manager, Doc Engineer, and QA

youtube
GStack + GSD + Superpowers Workflow Is Insane!

Market Signal

Why It Has Market Pull

gstack is Garry Tan's open-sourced Claude Code setup, 23 opinionated agent personas (CEO, Designer, Eng Manager, QA, etc.) with slash-command workflows, and one of the fastest-growing dev repos of 2026. It is squarely AI-builder tooling with genuine hands-on adoption, though much of its viral reach is attributable to Tan's YC megaphone and detractors frame it as repackaged prompt engineering.

  • ~117k stars and ~17.4k forks (June 2026); grew from ~20k at launch (Mar 17) to 66k by Apr 6, one of 2026's steepest repo curves
  • Open-sourced MIT by Garry Tan, President & CEO of Y Combinator, the source of both its virality and the backlash
  • Runtime-agnostic agent workflow (plan, build, review, QA, ship) requiring Claude Pro/Team
  • Major coverage from Hacker News and TechCrunch; trended on Product Hunt
  • High fork-to-star ratio suggests real hands-on use, not just star-bombing

feedbacks

What People Are Saying

  • "This thing is absolutely wild, it dramatically improved code quality and speed."HN comment

  • "The role decomposition into distinct specialist personas is the pattern worth paying attention to."HN comment

  • "A brilliant setup for maximizing Claude Code's velocity."HN comment

  • "Is the telemetry on usage data a backdoor way for YC to get signal on what people build?"HN comment

  • "An agent got stuck in a 70-minute loop injecting a staging URL into production config."HN comment

  • "It's a bunch of prompts in a text file."X reply

  • "If you weren't the CEO of YC, this wouldn't be on Product Hunt."X reply

GitHub57.0K

Fission-AI/OpenSpec

Spec-driven development (SDD) for AI coding assistants.

youtube
OpenSpec: NEW Toolkit Ends Vibe Coding! 100x Better Than Vibe Coding (Full Tutorial)

Market Signal

Why It Has Market Pull

OpenSpec is one of the breakout developer tools of the cycle: a spec-driven development workflow that makes you and your AI coding assistant agree on a short spec and task list before any code is written. From a standing start in August 2025 it has crossed ~57k stars, and it integrates broadly across the agentic-coding ecosystem (Claude Code, Codex, Cursor, and 25+ tools).

  • ~57k GitHub stars and ~4k forks in roughly 10 months (created Aug 2025), exceptional growth velocity
  • Very actively maintained: 433 open issues and frequent pushes indicate real usage and engagement, not a dormant star-magnet
  • Broad integration surface: works with 25+ AI coding tools plus pnpm/yarn/bun/nix; slash-command workflow (/opsx:propose, /opsx:apply, /opsx:archive)
  • Rides the validated spec-driven-development wave alongside GitHub's own spec-kit, signaling a real category rather than a one-off
  • Recommends high-reasoning models (Codex, Opus-class) for planning/implementation, positioning it for serious production coding agents

feedbacks

What People Are Saying

  • "You and your AI assistant agree on what to build before any code is written, that alone cut my rework."Reddit r/ClaudeAI

  • "The propose/apply/archive loop keeps the agent from wandering off-spec on big changes."HN comment

  • "Works across Claude Code, Codex and Cursor, so I'm not locked into one assistant."GitHub issue

  • "Best results really do come from high-reasoning models; weaker models produce sloppy specs."GitHub issue

  • "Spec-driven development is finally getting tooling that isn't just a prompt template."X reply

  • "Setup is two terminal steps then you live in chat, low friction to adopt."GitHub issue

GitHub23.7K

topoteretes/cognee

Cognee is the open-source AI memory platform for agents. Give your AI agents persistent long-term memory across sessions with a self-hosted knowledge graph engine.

youtube
Cognee: Superior AI Memory & Knowledge For AI Agents! Greatly Beats ChatGPT! (Opensource)

Market Signal

Why It Has Market Pull

cognee is a well-funded open-source AI memory platform that builds self-hosted knowledge graphs (graph-RAG) for agents, and one of the most credible entries in the hot agent-memory category. It pairs durable organic growth with a recent seed round and real production usage, plus genuinely balanced technical feedback, though it is the heavyweight option, with notable setup cost and resource overhead.

  • ~23.7k stars and ~2.2k forks built organically since 2023; latest release v1.2.2 (June 2026), now shipping Python, Rust, and TypeScript
  • Raised a EUR 7.5M / $7.5M seed (Feb 2026) led by Pebblebed with 42CAP and Vermilion plus DeepMind/n8n/Snowplow angels
  • Berlin-based cognee inc, founded 2024; reports 70+ live production environments and 80+ contributors
  • Builds knowledge graphs via ECL (Extract-Cognify-Load) pipelines combining embeddings and graph reasoning; connects to any OpenAI-compatible endpoint including Ollama
  • Benchmarked among the agent-memory leaders (Mem0, Zep, Letta, cognee) as the most powerful but heaviest option

feedbacks

What People Are Saying

  • "Genuinely the bridge between vector RAG and graph RAG."GitHub issue

  • "Reads like a data-flow recipe, each Task is a thin wrapper with a batch_size config."GitHub issue

  • "For every chunk, cognify runs a structured-extraction call plus N embedding calls, a 100-chunk doc easily generates 200+ LLM calls."GitHub issue

  • "8 GB RAM is the recommended floor, heavy on a low-end NAS."GitHub issue

  • "cognee.add() and cognify() hang indefinitely with a local OpenAI-compatible LLM on macOS, no error, no logs."GitHub issue

  • "Lack of scenarios showing iterative ingestion where sources are added at different times."GitHub issue

  • "If your memory problem is shaped like a graph, documents, entities, relationships, codebases, pick Cognee."Dev.to article

GitHub22.0K

google-labs-code/design.md

A format specification for describing a visual identity to coding agents. DESIGN.md gives agents a persistent, structured understanding of a design system.

youtube
Meet DESIGN.md: A new open standard for AI-generated UI

Market Signal

Why It Has Market Pull

DESIGN.md is a viral, fast-moving spec from Google Labs that gives coding agents a persistent, structured understanding of a design system, the same shape as CLAUDE.md or AGENTS.md but for visual decisions. It racked up tens of thousands of stars in weeks and spawned a real ecosystem of generators and tool integrations, though the format is still alpha and the early growth was heavily Google-amplified.

  • ~22.1k stars and ~1.8k forks on the official google-labs-code/design.md repo; latest release v0.3.0 (June 15, 2026)
  • Open-sourced April 21, 2026 under Apache 2.0; reportedly ~5.2k stars in 72 hours and ~10k by ~8 days
  • Built by the Google Labs Stitch team and deliberately detached from the Stitch product so any agent can consume it
  • Ecosystem pull beyond the core repo: a community awesome-design-md collection surged past ~64k stars, plus third-party generators and a proposal for native Claude skills consumption
  • Integrates with Cursor, Claude Code, and Copilot; the related coding-agent-as-design-engine discussion drew 232 points and 92 comments

feedbacks

What People Are Saying

  • "A dead-simple pattern that helps enormously with steering the model to the right code area."HN comment

  • "Great at helping with design consistency and building UIs that don't feel like slop."HN comment

  • "Instead of going back and forth with prompts, you give the agent a file that defines the design system up front."HN comment

  • "It's emerging as a shared contract for agent-driven UI, same shape as CLAUDE.md but for visual decisions."Dev.to article

  • "14k stars in a week is doing a lot of work here; nobody finds a repo that fast organically."HN comment

  • "The README is unnerving; do people really see the salesman-style writing as normal?"HN comment

  • "The designs they present are actually quite bad: random fonts, bad contrast."HN comment

Sources

GitHub

ripienaar/free-for-dev

124.0K

A list of SaaS, PaaS and IaaS offerings that have free tiers of interest to devops and infradev

NanmiCoder/MediaCrawler

53.7K

小红书笔记 | 评论爬虫、抖音视频 | 评论爬虫、快手视频 | 评论爬虫、B 站视频 ｜ 评论爬虫、微博帖子 ｜ 评论爬虫、百度贴吧帖子 ｜ 百度贴吧评论回复爬虫 | 知乎问答文章｜评论爬虫

luongnv89/claude-howto

38.5K

A visual, example-driven guide to Claude Code — from basic concepts to advanced agents, with copy-paste templates that bring immediate value.

IceWhaleTech/CasaOS

35.6K

CasaOS - A simple, easy-to-use, elegant open-source Personal Cloud system.

keycloak/keycloak

35.1K

Open Source Identity and Access Management For Modern Applications and Services

hugohe3/ppt-master

32.8K

AI generates a real, editable PowerPoint from any document — native shapes & animations, speaker notes voiced as audio narration, and the option to follow your own .pptx template, not slide images · by Hugo He

Product Hunt

Agent Arena

344

Agent Arena is an open competition network where autonomous agents compete in real-world challenges, earn rewards, build reputation, and evolve over time. Create or join any competition, unlock what your agent can truly become inside a living ecosystem. Welcome to the first arena built for AI agents.

Gemini Spark

328

Gemini Spark helps you navigate your digital life. Give it a task and it works in the background 24/7, even if your phone and laptop are turned off. It operates autonomously, but always under your direction. You choose to turn it on and it's designed to check with you before taking major actions.

note.md

269

A local-first research workspace for Mac. Read papers, manage sources, take markdown notes, cite evidence, and turn literature into structured writing — instead of juggling Zotero, Obsidian, PDF readers and writing apps.

ModuleX

148

ModuleX is an AI workspace already connected to 200+ integrations. Describe what you want, and your assistant answers with your data, acts through your tools, and turns the work into a visual workflow your team can edit together. If you want, it pauses for your approval before a step touches a customer. No API-key hunting: for a set of premium tools we bring the keys, or bring your own at zero markup. No empty canvas, no setup tax.

Basedash for Excel

138

Basedash now works with Excel, both ways. Drop anxlsx file into the agent and it reads your data, analyzes it, and builds charts and dashboards in seconds — no formulas, no pivot tables. Then export any chart's data back to axlsx file with one click and keep working in spreadsheets. It's the fastest way for teams who live in Excel to add an AI data analyst, live dashboards, and real-time collaboration on top of the files they already trust. From Excel to dashboard, and back.

LockIn MCP

116

LockIn MCP is the first distraction block built for the AI agent era. Rather than using a bypassable Chrome extension, you now just tell your favourite agent to block distractions for you, and it can do it natively. No bypassing, pure focus.

Hacker News

OpenKnowledge – open source AI-first alternative to Obsidian/Notion

370 pts

Hi HN, Nick here. We’re launching OpenKnowledge ( https://openknowledge.ai/ ), a “what you see is what you get” markdown editor that has direct integrations with Claude, Codex, and other agents. Available as MacOS app or Web UI+CLI. Fully free/local and OSS. We built this because we wanted a Notion-like experience for writing and sharing markdown files across our team. Obsidian is the best alternative we tried, but found it doesn’t have a true WYSWIG UI and it didn’t integrate well with Claude/C... (370 points, 170 comments).

Smart model routing directly in Claude, Codex and Cursor

185 pts

We built a model router that plugs into coding agents (e.g. Claude Code, Codex, Cursor, etc.) and intelligently sends requests to the best model to serve them. Here's a quick demo of running it locally: https://www.youtube.com/watch?v=isKhAyivtfM . At Weave, we write most of our code with AI, and it's been getting more expensive. This came to a head when Opus 4.7 was released and, thanks to its tokenizer changes, our costs shot up. We knew we didn't need Opus for everything but we didn't want to... (185 points, 99 comments).

We post-trained a model that pen tests instead of refusing

93 pts

Anthropic and OpenAI's publicly available models are explicitly guard-railed so that they refuse offensive tasks. And their cyber-focussed models are gated for enterprises. This leaves SMEs and mid market open to major vulnerabilities. AI can be used as both an adversarial and defensive tool in the world of cyber. A worst case outcome is if only the adversaries have access. Meanwhile, most existing AI cyber tools are just wrappers. The problem is that they still have all the guardrails on from t... (93 points, 40 comments).

peerd – AI agent harness that runs entirely in your browser

73 pts

Hey HN. http://peerd.ai is an AI agent harness that lives entirely in your browser as a web extension. You don’t have to install a separate “AI browser”. You don’t have to bolt on or run some external process or manage a clunky mcp integration. It’s just a fully contained web extension, written in no build vanilla JS with minimal non-browser dependencies, using your own provider keys, and Apache 2. This isn’t just a fun hack. While it has largely been a solo side project, I genuinely believe the... (73 points, 23 comments).

Pure Effect – Reproduce production bugs on your laptop without a DB

58 pts

Hi HN, I think it's safe to say that the majority of developers don't give a second thought to writing code with I/O tangled in business logic. It's all too common to see code like: const user = findUser(email); if (!user) await saveUser(user); Now, you may ask: what's the big deal? When we write code like this, two things happen: 1. It gets harder to debug production bugs. Unless you have the exact same database and remote API services to connect to, you may fail to reproduce the bug. 2. You ha... (58 points, 14 comments).

Selector Forge – browser extension for AI-generated resilient selectors

38 pts

Hi HN, I'm Ahmad from the Intuned ( https://intunedhq.com ) team. Today, we're releasing and open-sourcing Selector Forge ( https://selectorforge.ai/ ), a browser extension that generates reliable CSS/XPath selectors using AI. You can use it to create a selector for a single element or for an array of elements. The selectors it creates are meant to be "semantic" and more resilient to page changes than what Chrome DevTool’s “Copy Selector” (and other similar extensions) give you. Those tend to ha... (38 points, 2 comments).

HF Spaces

DeepSite v4

16.6K likes

Generate any application by Vibe Coding it DeepSite is a Vibe Coding Platform designed to make coding smarter and more efficient. Tailored for developers, data scientists, and AI engineers, it integrates generative AI into your coding projects to enhance creativity and productivity. DeepSite v4 is a Hugging Face Space tagged with docker, region:us. It has 16617 likes on Hugging Face.

Open LLM Leaderboard

14.0K likes

Track, rank and evaluate open LLMs and chatbots Modern React interface for comparing Large Language Models (LLMs) in an open and reproducible way. 📊 Interactive table with advanced sorting and filtering 🔍 Semantic model search 📌 Pin models for comparison 📱 Responsive and modern interface 🎨 Dark/Light mode ⚡️ Optimized performance with virtualization The project is split into two main parts: React Material-UI TanStack Table & Virtual Express.js FastAPI Hugging Face API Docker The application is containerized using Docker and can be run using: Open LLM Leaderboard is a Hugging Face Space tagged with docker, leaderboard, modality:text, submission:automatic, test:public. It has 14035 likes on Hu...

AI Comic Factory

11.1K likes

Create your own AI comic with a single prompt Last release: AI Comic Factory 1.2 The AI Comic Factory has an official website: aicomicfactory.app For more information about my other projects please check linktr.ee/FLNGR. If you like the AI Comic Factory, let me know! I am always creating new spaces and exploring new ideas for demos, meaning I don't have much time to take care of all of them (I wish I could clone myself or ask robots to do it). If you appreciate the AI Comic Factory and would like to leave a tip, that would be very kind 🫶 First, I would like to highlight that everything is open-source (see here, here, here, here). However the project isn't a monolithic Space that can be dupli...

Kolors Virtual Try-On

10.1K likes

Kolors Virtual Try-On is a Hugging Face Space tagged with gradio, region:us. It has 10116 likes on Hugging Face.

Wan2.2 Animate

5.1K likes

Wan2.2 Animate is a Hugging Face Space tagged with gradio, region:us. It has 5114 likes on Hugging Face.

MusicGen

5.1K likes

AudioCraft is a PyTorch library for deep learning research on audio generation. AudioCraft contains inference and training code for two state-of-the-art AI generative models producing high-quality audio: AudioGen and MusicGen. Installation AudioCraft requires Python 3.9, PyTorch 2.0.0. To install AudioCraft, you can run the following: We also recommend having ffmpeg installed, either through your system or Anaconda: At the moment, AudioCraft contains the training code and inference code for: MusicGen: A state-of-the-art controllable text-to-music model. AudioGen: A state-of-the-art text-to-sound model. EnCodec: A state-of-the-art high fidelity neural audio codec. Multi Band Diffusion: An EnC...

AI Tools — June 27, 2026 Edition | Agentic Brew