Free Developer Tools

Copperhead is an open-source AI engineering platform and CLI that helps hardware teams design, verify, and ship printed circuit boards by editing KiCad files, running KiCad checks (ERC/DRC), and producing gerbers, firmware, and documentation in a gated, auditable pipeline.

Skillbay is a curated marketplace of AI agent skills (SKILL.md packages) that publishers and developers can browse, install, buy, or sell. Each skill includes human review and before-and-after examples, and the site exposes a JSON API and MCP server for integration.

Moadim is an open-source loop engine that schedules and runs AI agents (Claude, Codex, Hermes, NanoClaw, Pi) against a repository or task on a recurring schedule in isolated workbenches with watchdogs and built-in HTTP/MCP interfaces.

Docs.dev is a deployable documentation template that runs as a Cloudflare Worker in your account, using your GitHub repo as the source of truth and agent-powered drafting (e.g., Claude Code or Codex) to generate reviewable docs branches that your team publishes via commit.

Bullet is a fast coding agent and developer tool that routes, searches, and executes code-focused tasks with a tight loop to minimize latency — offered as a macOS download and currently available in private beta.

Codify is a cross-platform tool that declares and automates developer environments as code—via a CLI and dashboard—so teams and individuals can standardize, reproduce, and apply development setups on macOS, Linux, and WSL.

Knowl is a local-first, open-source persistent memory system for AI coding agents that records provenance, evidence, reasoning and supersession for every fact so agent answers stay current and auditable.

Sign in with ChatGPT lets developers add ChatGPT account authentication to web apps so users can access OpenAI AI capabilities (works across free and paid ChatGPT accounts). It provides React components and helper methods to obtain encrypted, locally stored credentials and call the AI SDK from the signed-in account.

mcptunnels is a lightweight CLI and relay for exposing a local MCP (Model Context Protocol) server as a public Streamable HTTP URL in one command — anonymous, ephemeral (24h), and OAuth 2.1‑protected by default, with an option to self‑host the relay.

Cockpit is a macOS app that consolidates and manages Claude Code and Codex agent sessions in a single local UI—organizing sessions, viewing transcripts and files, replying to prompts, and keeping versioned file histories without uploading data or requiring an account.

Forth MCP is a hosted relay that exposes local, NAT'd, or firewalled MCP servers behind a single secure URL so any MCP-speaking AI client (e.g., Claude, ChatGPT) can call your local tools without port forwarding or VPN.

Spore is a distributed AI platform that lets you run open-weight models on your own macOS, Windows, or Linux hardware, access them remotely via end-to-end encrypted connections, earn credits by serving requests, and tap a distributed network for larger models with an OpenAI-compatible API.

LLM Status is a model-lifecycle tracker and CLI that scans code repositories for AI model IDs, flags models that are deprecated or retiring, and offers automated fixes, CI checks, and cloud alerts to keep projects off retirement schedules.

SightDiff is a local visual regression tool that captures pixel-perfect screenshots of configured pages and states before and after an AI agent (or a human) makes changes, producing a proof sheet that highlights changed surfaces and verifies unchanged pages as a pre-commit gate.

Zlvox is a privacy-first collection of 30+ fast, browser-based developer utilities — AI tools, PDF and image processors, JSON/data utilities, QR and security tools — designed to run client-side with no sign-up or server-side data retention.

Thyme is a native desktop reverse-engineering IDE for Android apps and native binaries. It decompiles Java and analyzes ARM code locally, with optional licensed analysis features including a SQL-queryable workspace and native library analysis.

MQLens is a free, open-source native MongoDB GUI for macOS, Windows, and Linux focused on real developer workflows — supporting SSH/TLS/enterprise auth, aggregation pipelines with explain plans, GridFS, an embedded mongosh, and an optional AI query assistant.

Crest is a macOS app that surfaces Claude Code and Codex permission requests on the MacBook notch (or a pill on non-notch Macs), letting developers tap Allow or Deny from the notch so agent runs don't idle while waiting for terminal input.

TokenMaxxer is an AI usage intelligence platform for developers that tracks every AI token burned across coding tools and models, showing counts, estimated cost, and a global leaderboard so developers can monitor and compare usage.

Vestige is a Visual Studio Code extension that makes large, LLM-generated code changes reviewable by building local call-graphs and file-dependency graphs, surfacing blast-radius analysis, guided review cards, and LLM-generated summaries/explanations.

Scribe is a local-first CLI knowledge-base generator that automatically mines developer artifacts (git history, Claude Code & Codex sessions, self-sent URLs, and drop files), triages them with FTS5, and writes a cross-project, typed-graph markdown wiki in git for agents to read before they act.

DH Tools is a privacy-focused, in-browser suite of 46+ online web and developer utilities (PDF, image editing, AI OCR, JSON, networking, and more) that processes files locally with zero server data retention.

AI Meter is a macOS application that measures token usage from local coding agents and estimates associated electricity and direct cooling-water use, running fully on the user's machine with no accounts and no usage data leaving the device.

Viaduct is a C4 architecture modelling tool by Quiet Grid Labs that keeps a single, editable model across four C4 levels, attaches docs/diagrams/OpenAPI contracts to elements, and serves the architecture to AI coding agents via a hosted MCP server.