6 tools ranked by rating and popularity
Explore the top open-source AI code & development tools you can self-host, customize, and contribute to.
Llama.cpp is a highly optimized inference engine for running Llama-family and other LLMs in pure C++ with minimal dependencies. Enables fast inference on CPUs via quantization, powers many local AI tools under the hood, and supports GPU offloading.
Jan is an open-source ChatGPT alternative that runs completely offline on your computer. Download and run models locally with a clean chat interface, model hub, and an OpenAI-compatible API server built in. Supports Windows, macOS, and Linux.
The Vercel AI SDK provides TypeScript tools for building AI-powered streaming interfaces. It supports multiple LLM providers, offers React hooks for chat UIs, and simplifies building AI features into Next.js and other web applications.
GPT4All by Nomic AI is a free open-source ecosystem for running LLMs locally on CPUs and GPUs. Features a simple desktop chat application, a model library of 1000+ models, and a developer SDK. No GPU required for many models.
Refact.ai is an open-source AI coding assistant that can be self-hosted for complete privacy. Features fine-tuning on your codebase, code completion, and chat. Supports VS Code and JetBrains with models that learn your specific coding patterns.
Plandex is an open-source terminal-based AI coding agent built for large, real-world software projects. Uses long-running agents with built-in planning, versioning, and automatic context management to tackle complex multi-file coding tasks reliably.
The top open source AI code & development tools in 2026 include Llama.cpp, Jan AI, Vercel AI SDK and 3 more. These tools are ranked by rating and popularity.
Consider your budget, required features, ease of use, and team size. Browse our curated list and compare features, pricing, and user ratings to find the best fit.
Yes, all open-source tools listed here are free. You can self-host them or use community-hosted versions.