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Hallmark — Open-source design skill for Claude Code, Cursor and Codex that steers agents away from the generic 'AI slop' UI look.

opencode — Free, open-source AI coding agent for the terminal, an alternative to Claude Code or Cursor that works with any LLM provider.

Pi — Open-source AI agent toolkit: a unified LLM API, agent loop, terminal UI and a coding-agent CLI that works with many model providers.

Cindy — Open-source AI agent app that brings Claude Code, Codex and Pi, models, tools, memory and skills into one place across your computers and phone. Free with your own keys; optional paid managed models.

Cloudflare Security Audit Skill — Open-source coding-agent skill from Cloudflare that runs multi-phase security audits (recon, coverage-led hunting, candidate validation) with independently verified, machine-readable findings.

Open Computer Use — Open-source MCP server that lets AI agents control desktops on macOS, Linux and Windows; installs into Codex, Claude Code, Gemini CLI and opencode.

OpenFilm — Open-source AI video agent: turns Claude Code, Codex or any coding agent into a video maker, with a local editor to change any text, colour or clip by hand.

SkillSpector — NVIDIA's open-source security scanner for AI agent skills: catches prompt injection, data exfiltration, malicious patterns and supply-chain risks in Claude Code, Codex and MCP skills before you install them.

tstack — Theo's open-source set of nine everyday agent skills for Claude Code and Codex, including 'council', which has three models from different providers review a change until they agree.

CleanYourTV — Debloat any Android TV or Google TV over Wi-Fi and swap the ad-filled home screen for a clean Apple TV-style launcher. No root, fully reversible; run it with Claude Code, Codex or Gemini CLI.

Lemo-Opuscar — 59 film styles for Claude Code: each is a reusable prompt plus a short film made entirely in code, with narration and music and no video model. Installs as a Claude Code plugin.

Spec Kit — GitHub's open-source toolkit for spec-driven development: write the spec first, then let Claude Code, Copilot, Gemini CLI or other agents plan and build from it.

Impeccable — A design language and skill for coding agents: 62 rule-based checks that stop generic 'AI slop' UIs and give Claude Code, Codex, Cursor and others the vocabulary for real typography, spacing and colour.

Inbox Zero — AI email assistant and inbox client for Gmail and Outlook: AI sorting, drafted replies, bulk unsubscribe and cold-email blocking. Free client; AI is paid or self-hosted. Source available (AGPL-3.0 plus extra terms).

OpenSEO — Open-source Semrush/Ahrefs alternative: pay-as-you-go SEO data via DataForSEO, plus a native MCP server and agent skills so your AI agent can query keyword and backlink data. Self-hostable, MIT.

Knowledge Work Plugins — Anthropic's official open-source plugins for Claude Cowork knowledge work (sales, finance, legal, support, research and more). A reference for building your own agent plugins.

PPT Master — AI turns documents or topics into real, editable PowerPoint decks with native shapes, charts, tables and transitions, narration from speaker notes and support for your own .pptx templates. Runs inside a coding agent.

prompts.chat — Free open prompt library (formerly awesome-chatgpt-prompts) for ChatGPT, Claude, Gemini and more. Use it via the website, a CLI, an MCP server or a Claude Code plugin.

AI Job Search — Local AI job-application framework built on Claude Code. It evaluates postings, tailors your CV, writes cover letters and preps you for interviews. MIT.

Graphify — Turns a whole codebase (docs, SQL schemas, configs, PDFs) into a queryable knowledge graph, as a /graphify skill for Claude Code, Cursor, Codex and Gemini CLI. Open-source engine (Apache-2.0); hosted Free and paid plans on the site.

Headroom — Local context compression for AI agents. It shrinks tool output, logs, files and RAG chunks before they reach the LLM: about 20% fewer tokens for coding agents and 60-95% for JSON. Apache-2.0.

ChatVault — One free open-source desktop app for all your AI coding chats (Claude Code, Codex, Cursor, Gemini CLI, OpenCode, Cline): search, back up, and continue any chat in the tool you like. Windows 10/11 only for now.

ponytail — Makes AI coding agents write the least code that works ('the laziest senior dev in the room'). v5 claims 53% less code and 45% fewer output tokens; shows task cost in Claude Code.

The Agency (Agency Agents) — A big roster of specialised AI agent personalities, now with a native desktop app (macOS, Linux, Windows) that installs them into Claude Code, Cursor, Codex, Gemini CLI and more in one click.

Lumi GEO — Free Chrome extension that shows a page the way AI crawlers see it, scores it out of 100 for SEO, GEO and AEO, and writes the code to fix what they miss.

Octop — Tencent's self-hosted, multi-user AI assistant workspace; v1.0.2 adds team mode and agents that work across machines. Website in Chinese.

XERJ — Local-first search engine and MCP server for AI agents: one Rust binary indexes code, docs and logs and replaces search, vector DB, embeddings and agent memory (run xerj autoindex).

ai-memory — One shared long-term memory you own for 30+ coding agents: quit Claude Code mid-task, open Codex in the same folder and it picks up where you left off.

coucou — A tiny friend in your Mac's notch and on your iPhone that watches your coding agents (Claude Code, Codex, Cursor, Gemini CLI, Antigravity) and lets you approve from the notch or Lock Screen.

Scientific Agent Skills — 177 validated science skills plus 100+ scientific databases (biology, chemistry, medicine, drug discovery) that turn Claude Code, Cursor, Codex and other agents into a research helper.

Agent Standup — Shows your Claude Code, Codex and Mistral Vibe sessions as a live animated team call: who's working, who's waiting, who needs you, plus session replays. Local, zero tokens.

Open Design — Open-source, local-first design workspace for coding agents (Claude Code, Codex, Cursor, OpenCode): prototypes, landing pages, dashboards, slides and code-built motion video exported as MP4.

SolidCraft — Open-source parametric 3D CAD app written in pure Rust, on desktop and web, with a built-in MCP server so agents like Claude Code can design real, hand-editable parts.

AgentPlay — Free, open-source local replay for coding-agent sessions (Claude Code, Codex, Cursor, Copilot): see files read, tools, errors, retries and helper agents on a map and timeline, built from local session logs.

Marketing Skills — Open-source library of ~50 marketing skills for AI coding agents (SEO, CRO, copywriting, cold email, pricing, analytics) for Claude Code, Cursor and Codex.

Ruflo — Open-source harness for running teams of AI agents together, with shared memory and native Claude Code / Codex integration (formerly Claude-Flow lineage, by ruvnet).

HarnessRouter — Self-hosted Unified Harness Protocol (UHP) community edition: one interface to run agent tasks across Codex, Claude Code, Hermes, PI, DSH, and more.

Strix — Open-source AI penetration-testing tool: agents actively probe apps (SQLi, XSS, etc.) and try to prove exploits, not just static-scan.

Claude Code Game Studios — MIT template that turns Claude Code into a game-dev studio: 49 agents, 72 workflow skills and a coordination system that mirrors a real studio hierarchy, with Godot, Unity and Unreal support.

REA — MIT toolkit that lets your coding agent reverse engineer apps, games, websites and native binaries: decompile, trace behaviour, collect evidence and recreate features for your own stack.

Context Mode — MCP server and hooks that keep large tool output in a local sandbox and send only the result to your coding agent, with session memory that survives compaction. Works with Claude Code, Codex, Cursor and more.

Matt Pocock Skills — MIT set of small, composable agent skills from Matt Pocock's own .agents folder, for Claude Code, Codex, Cursor and other agents. /grill-me questions you about a plan until it is clear, and other skills cover TDD, code review and retros.

VoiceStudio — Open-source, fully local alternative to ElevenLabs: voice cloning, voice design, video dubbing, dictation, transcription and audiobooks. Uses Metal on Apple Silicon and ships an MCP server so agents can call it.

Anatomy — Claude Code skill (also works in OpenCode and Codex) that draws detailed interactive isometric illustrations of real machines and systems: polished SVG with optional WebGL and a 3D mode, parts you can click and move.

Archify — MIT agent skill for Claude Code, Codex, Cursor and more: turns a description, plan or codebase into a validated interactive HTML diagram you can explore and export from the browser.

OpenRig — Runs Claude Code, Codex and Pi agents as one persistent team: define roles in YAML, start the rig with one command, and talk to a lead agent while specialists share context on long projects.

claude-devtools — Open-source desktop app that turns Claude Code session logs into a visual timeline: inspect tool calls, token usage and subagents.

claude-mem — Persistent memory for coding agents: captures session work, compresses it with AI, and injects relevant context into future sessions (Claude Code, Codex, Copilot, OpenCode and more).

diagram-design — Agent skill for editorial HTML/SVG diagrams: 40+ diagram types for Claude Code, Codex, Cursor and Copilot. Self-contained output, no Mermaid slop.

Hindsight — Open-source agent memory that learns from what your agents did before, so coding agents stop repeating mistakes. MIT.

Jarhead — Open-source voice-first Mac assistant that uses the computer for you: wake word, Codex/Claude Code/local-model brains, alarms and automations, a notch control surface and a console into every coding-agent session.

Maestro — Desktop app to orchestrate AI coding agents (Claude Code, Codex and 8 more): agents that consult each other, phone app, goal-driven Auto Run and a manager agent. 1.0 just shipped.

OpenUI — Open standard for generative UI: a streaming-first language with React, Vue, Svelte and Angular runtimes, MIT licensed.

Perch — Mac app that puts Claude, Codex and other coding-agent sessions in the MacBook notch: sign in once, reply to any session and start new ones without switching apps.

universal-modder — Skills, tools and a fal MCP server that let Claude Code, Codex or Cursor mod PC games you own: finds the engine, reverse-engineers it, builds the mod and tests it in-game. MIT.

Watercolor Playground — Open-source browser watercolor app: pigments mix as spectra, washes bloom and dry with tide lines, traces any SVG with a brush, 58 single-stroke fonts.

T3 Code — Open-source control surface for the coding agents already on your machine — Claude Code, Codex, Cursor, OpenCode, Antigravity — from one desktop, web or mobile app. MIT.

LocalGuard — Local proxy that redacts credential-shaped secrets on coding-agent API traffic (Claude Code / MCP / Cursor) before they leave the machine. macOS/Linux/Windows, <50ms, zero telemetry.

Qwen Live Harness — Open-source agent harness for Qwen3.8 Omni Flash Realtime — audio/video agent sessions with memory; plugs into Claude Code / Codex / Copilot.

code-review-graph — Open-source local map of your codebase so AI coding agents read only the relevant slices instead of whole files — MCP plug-in for Claude Code and other agents. Reports ~8.9× fewer tokens on sample questions.

Umbod — Self-hosted OSS layer for agent access control: connect internal APIs and MCP servers, grant tools by group, run on Kubernetes via Helm. Agent-agnostic (Claude Code, Codex, Cursor, etc.).

Snibet — AI tweet co-pilot for a single X post: dump a raw idea, pick a stance, generate. Sign-up required, with a trial then a paid Pro plan.

OpenWysiwyg — A quiet HTML, Markdown and visual editor. Switch between the rendered page and its source without rewriting it; drafts stay in your browser.

Spotifast — Native Spotify client for Linux, macOS and Windows, with library search, local playback, Spotify Connect and Omarchy themes. Spotify Premium is required for playback.

ZapFast — Native WhatsApp desktop client for Linux, macOS and Windows, with chat, voice messages, attachments and desktop notifications.

NOOP — Offline companion for WHOOP straps, with Bluetooth sync, local activity and sleep tracking, and an optional AI coach. Available on Mac, Android and iPhone.

TriageBox — Gmail triage for Chrome and Android: archive, snooze, unsubscribe and clear your inbox, with optional AI summaries and help using your own key.

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