Open Source Developer Tools Apps

Statically typed feature flags, remote config, and A/B testing with framework-native SDKs for TypeScript teams.

Like htop, but for your AI coding agents — monitor Claude Code, Codex CLI, and OpenCode sessions, tokens, context windows, rate limits, and orphan ports all from one terminal screen.

The open-source LLMOps platform unifying prompt engineering, evaluation, and observability for teams building reliable LLM applications.

An open source AI-native proxy that secures, observes, and governs agent-to-LLM, agent-to-tool, and agent-to-agent communication through MCP, A2A, and unified LLM routing.

A real-time, fully local observability dashboard for Claude Code and Codex agent sessions — filtering, search, session replay, and token/cost breakdowns via an auto-starting MCP server.

A VS Code extension that reads your local AI coding session logs and turns them into actionable insights — anti-pattern detection across 45 rules, output tracking by model and harness, and skill discovery, with no data leaving your machine.

Open-source ELT platform with 600+ connectors for moving data from any source to warehouses, lakes, and AI agents.

A backend-agnostic composable commerce framework that connects Vue.js, Nuxt, React, and Next.js storefronts to any eCommerce platform through a shared middleware and factory-generated composables.

Create production-ready backend services with your organization's standards baked in — generating NestJS, Prisma, and GraphQL code that you own and control.

Fast, stable Redis GUI with cluster, SSH, and massive key support

The all-in-one AI platform for private document chat, no-code agents, and local LLMs with zero setup friction.

Open-source low-code platform to build admin panels, dashboards, and internal tools connected to any database or API.

Open-source backend platform with Auth, Databases, Storage, Functions, Messaging, Realtime, and Sites — deploy via Docker or use Appwrite Cloud.

Cloud-scale load testing and functional testing for APIs, WebSockets, gRPC, and headless browsers, distributed across AWS Lambda or Fargate with zero infrastructure to manage.

Run AI workloads at scale with a Pythonic serverless runtime that handles GPU inference, background jobs, and sandboxes with zero infrastructure overhead.

Computer-vision powered Python framework for building RPA bots that click, type, and read any desktop, web, or terminal UI without needing an API.

Run headless Chrome, Firefox, and WebKit as a managed Docker service — drop-in Puppeteer and Playwright support with no infrastructure overhead.

Self-hosted error tracking that accepts Sentry SDKs out of the box, so you keep your instrumentation and drop the monthly bill.

An all-in-one JavaScript and TypeScript toolkit — one Rust-and-JavaScriptCore binary that replaces Node.js, npm, a bundler, and a test runner with faster equivalents.

High-performance job queue for Bun — SQLite persistence, cron scheduling, DLQ, S3 backups, and a native MCP server, all without Redis.

Deploy any app, database, or website to your own server in minutes—no Docker or Linux expertise required.

Run Claw AI agents entirely in the browser — no server required — with WebContainers WASM sandboxing, policy enforcement, and complete audit logging.

A native, Ghostty-based macOS terminal with vertical tabs, agent-aware notifications, and a scriptable browser built for running many parallel AI coding agent sessions instead of juggling tmux panes.

Open-source, cross-platform 2D/3D game engine with Vulkan, Metal, and WebGL support for web, mobile, and instant gaming platforms

A pre-indexed code knowledge graph that cuts AI tool calls by 58% and token costs by 16% — auto-syncing, 100% local, works with Claude Code, Cursor, Codex, and more.

A temporal code knowledge graph with blast-radius impact scoring, semantic symbol search, and git-history-aware dependency analysis for AI-assisted development — zero required runtime dependencies, SQLite-backed.

Self-hosted cloud development environments and AI coding agents — defined in Terraform, connected via WireGuard, automatically shut down when idle.

Instantly ready browser-based IDE that runs full npm dependency resolution and transpilation entirely client-side, with no server needed.

An open-source CLI that packages machine learning models into standard, production-ready Docker containers — no Dockerfile wrangling, no CUDA version hell.

Open-source coding agent for VS Code, JetBrains, and CLI with support for 30+ LLM providers.

Self-hosted file converter that wraps 20+ specialized tools to convert over a thousand formats — no cloud, no limits.

Open-source reactive database that lets developers build live-updating apps with pure TypeScript, strong consistency, and real-time subscriptions—no separate API layer required.

Convoy is an open-source, cloud-native webhooks gateway that ingests events over HTTP or straight from Kafka, SQS, Google Pub/Sub, and RabbitMQ, then reliably delivers them to subscriber endpoints with signed payloads, automatic retries, circuit breaking, and JavaScript-based transformations.

Google's internal tool, open-sourced, for transforming and moving code between repositories — keeping a confidential and public repo in sync, importing external contributions into an authoritative repo, or migrating code once.

A keyboard-driven terminal dashboard for managing cron jobs on local machines and remote servers via SSH.

Your terminal coding companion — wire up any LLM with LSP intelligence, MCP extensibility, and a skills system that learns your workflow.

Extract clean article content and rich metadata from any web page, delivered as HTML or Markdown with zero clutter.

Self-hosted, open-source Vercel alternative that deploys Python, Node.js, PHP, and any Docker-compatible app from a Git push, with zero-downtime rollouts and real-time logs.

41 offline-first developer utilities in a single 10MB cross-platform desktop app — no Electron, no cloud, no compromise.

Visual LLM workflow platform with RAG pipelines, agent capabilities, and model management for building production AI applications.

Run Terraform and OpenTofu natively inside your existing CI pipeline — no separate runners, no third-party secrets, no extra compute costs.

The open-source container engine at the heart of Docker — a modular toolkit of runtime, build, and networking components for assembling container-based systems.

The SQL database you can branch, merge, diff, and clone — Git for your data, MySQL-compatible and ready for multi-agent AI workflows.

A modern Redis and Memcached replacement engineered for multi-core servers — delivering 25x more throughput, better cache hit rates, and up to 80% lower memory consumption with full API compatibility.

Build internal tools and admin panels faster with AI-generated Python code, fully self-hosted and local-first.

A local-first monorepo led by Whispering, an open-source speech-to-text app, built on an MIT toolkit that turns your data into plain Markdown and SQLite files you own instead of a database you rent.

Define AI agent workflows as code graphs, route tasks across any LLM, and intervene only where it matters.

Self-hosted, enterprise-grade feature flag platform for safe, targeted, and data-driven feature releases.

Fern turns a single OpenAPI, AsyncAPI, or Protobuf definition into type-safe SDKs for nine languages and a hosted API documentation site, all from one CLI and one source of truth.

Turn any website into clean, LLM-ready data with a single API call — no proxy headaches, no scraping complexity.

Open-source feature flagging, remote config, and A/B/multivariate testing platform for web, mobile, and server-side apps — self-host or use the hosted SaaS.

Git-native feature flag platform that stores, versions, and deploys feature toggles directly in your own Git repositories with no external database required.

Drag-and-drop visual builder for AI agents, RAG pipelines, and multi-agent systems—deploy anywhere in minutes.

A privacy-first, graph-based OSINT investigation platform with 30+ automated enrichers for mapping relationships between domains, IPs, people, and organizations.

Build autonomous AI agents and powerful workflows with a programmable TypeScript harness that gives any model sessions, tools, sandboxes, and durable execution.

Drag-and-drop retro Game Boy game creator that compiles real ROMs — no coding required.

No-code, open-source game engine for building 2D, 3D and multiplayer games — publish to iOS, Android, Steam and the web.

Fast, native, feature-rich terminal emulator with GPU acceleration and an embeddable libghostty library for building custom terminals

Git, but better — a modern version control client with stacked branches, parallel workflows, unlimited undo, and first-class support for AI-powered development.

Turn any GitHub repository into an interactive architecture diagram in seconds

Self-hosted DevOps in a single Go binary — Git hosting, GitHub Actions-compatible CI/CD, and 30+ package registries without any SaaS dependency.

The complete DevOps platform that unifies Git hosting, CI/CD, issue tracking, and security scanning into a single self-hostable application.

Index any codebase into an interactive knowledge graph and give your AI agents deep architectural context via MCP — with zero servers required.

A next-generation Kubernetes package manager with a GUI, CLI, and native GitOps integration that makes deploying cluster workloads 20x faster than Helm.

Free, MIT-licensed 2D and 3D game engine with one-click multi-platform export and no royalties.

The painless self-hosted Git service that runs on anything from a Raspberry Pi to a $5 cloud droplet, delivering GitHub-like workflows as a single Go binary.

Open source feature flags, A/B testing, and warehouse-native experimentation that queries your existing data infrastructure—no data movement required.

A unified open source DevOps platform combining Git hosting, CI/CD pipelines, cloud development environments, and artifact registries in a single self-hosted system.

A Postgres-backed orchestration engine for background tasks, AI agents, and durable workflows that replaces Redis queues and multi-datastore durable execution platforms with a single self-hostable service.

Compress everything your AI agent reads — tool outputs, logs, RAG chunks, and files — before it reaches the LLM, achieving 60–95% fewer tokens with the same answers.

Open-source full-stack monitoring that unifies session replay, error tracking, logging, and distributed tracing so you can stop context-switching between tools.

Open-source GraphQL schema registry and observability platform with breaking change detection, federation support, and CI/CD integration for teams of any size.

A lightweight, offline-capable API development ecosystem for testing HTTP, GraphQL, WebSocket, MQTT, and SSE endpoints across web, desktop, and CLI.

Open source observability platform that unifies logs, traces, metrics, and session replays on ClickHouse — now the core of ClickStack.

Compose, extend, and observe every backend service in real time using three primitives: Workers, Functions, and Triggers.

Open-source low-code platform for building internal tools with drag-and-drop UI, reactive data bindings, and real-time collaboration.

Infracost shows cloud cost estimates for Terraform, CloudFormation, and AWS CDK before you deploy — in your terminal, editor, AI coding agent, and pull requests.

The all-in-one, open-source backend platform purpose-built for AI coding agents — giving your agent database, auth, storage, edge functions, a model gateway, and compute to ship full-stack apps end-to-end.

A React component that lets developers embed a fully-featured, isometric network diagram editor directly into their applications.

A unified collection of 88 web-based developer utilities — from JSON formatting to subnet calculation — all self-hostable, keyboard-searchable, and offline-ready.

The superpowered headless CMS for developers built with GraphQL and React

Transform messy, unstructured documents into persistent, navigable memory that AI agents can actually use.

The official Lark/Feishu CLI tool built for both humans and AI agents, delivering 200+ commands and 26 AI agent skills across 18 business domains from messaging and calendar to docs, sheets, and approvals.

The programmable open source core ledger for fintech — build money-moving applications with atomic multi-posting transactions, account-based modeling, and Numscript, a built-in DSL for financial logic.

Unite every major AI model in one self-hosted chat platform with agents, code execution, MCP tools, and enterprise authentication.

Define your software architecture as code and get always up-to-date, interactive C4 diagrams generated automatically from a DSL.

Open source AI gateway and Python SDK that gives you one OpenAI-compatible interface to call 100+ LLM providers, with built-in routing, cost tracking, guardrails, and virtual keys.

A fast, lightweight, open-source document parser that extracts spatial text, bounding boxes, and Markdown from PDFs and Office files — entirely on your machine.

AI-powered file type detection that identifies 200+ content types with ~99% accuracy in milliseconds using a compact deep learning model.

A reactive Python notebook that eliminates hidden state, runs reproducibly, and deploys as a web app or script — stored as pure Python, built for the AI era.

A free, local-first developer workspace unifying snippets, notes, HTTP requests, calculations, drawings, and dev tools in one desktop app.

An open-source, FHIR-native healthcare platform that gives developers a compliant backend, authentication, a React component library, and serverless bots to build clinical applications in weeks instead of years.

The AI code editor where every chat message is a git commit you can revert, branch, or squash

The open source operating system and SDK that lets developers build one app and run it across smart glasses from Even Realities, Vuzix, Mentra Live, and more.

Self-hostable platform for running autonomous coding agents in isolated, credentialless sandboxes with brokered credentials, reusable snapshots, and event-driven triggers.

A source-controlled A/B testing stack that lets teams define experiments as versioned YAML/JS, deliver them with a sub-5KB script, and analyze results through Snowplow events and RMarkdown reports — Git and CI replace the vendor dashboard.

Run LLM-generated Python code safely inside your agent—no containers, no CPython, no compromise—with sub-microsecond startup.

Open-source game backend server with built-in multiplayer, matchmaking, leaderboards, chat, authentication, and storage — deploy anywhere via Docker or binary.

Build product integrations with AI using 800+ APIs — auth, proxy, and TypeScript functions on production-grade infrastructure.

The offline-first networking toolbox for sysadmins — 100+ subnet, DNS, DHCP, and TLS utilities that work without internet access.

Turn natural language into professional draw.io diagrams with AI, cloud icons, and an MCP server for your IDE.

A modern web UI for nginx that eliminates config file editing with visual virtual hosts, SSL automation, Docker integrations, and real-time traffic analytics.

Manage Nginx reverse proxies and free Let's Encrypt SSL through a beautiful web interface — no Nginx expertise required.

Open-source communication infrastructure that connects your products and AI agents to every channel your users live on — Inbox, Email, SMS, Push, Chat, and more.

Send push notifications to your phone or desktop from any script or service using a single HTTP PUT or POST—no sign-up required.

A lightweight, stealthy headless browser written in Rust — drop-in compatible with Puppeteer and Playwright, built for AI agents and web scraping at scale.

Develop applications directly inside your Kubernetes cluster with real-time file sync and instant hot-reload — no more docker build/redeploy cycles.

Run Llama, Gemma, DeepSeek, and other open LLMs on your own machine with one command and an OpenAI-compatible API.

Open-source reference app for building and running background AI coding agents on Vercel — from chat prompt to committed code changes without keeping your laptop involved.

The AI code review agent born at Alibaba's scale — combining deterministic engineering with LLM intelligence for precise, token-efficient reviews.

Pay-as-you-go open source SEO platform with MCP integration — keyword research, rank tracking, backlinks, site audits, and AI brand visibility in one self-hosted tool.