Roundup

The Best Open Source AI Tools for Developers in 2026

From local LLMs to AI frameworks, these open source tools are giving proprietary solutions a run for their money.

Leanne ThuongDec 10, 202512 min read

Open source AI is thriving. Here are the best tools you should know about.

Models

Llama 3.3 -- Meta's latest, competitive with GPT-4o

DeepSeek V3 -- Best open source coding model

Qwen 2.5 -- Excellent multilingual support

LangChain -- The most popular AI application framework

LlamaIndex -- Best for RAG applications

AI SDK -- Vercel's toolkit for AI-powered apps

Ollama -- Run any model locally with one command

Open WebUI -- ChatGPT-like interface for local models

n8n -- Self-hostable workflow automation

Control, privacy, cost savings, and the ability to customize. Open source AI tools are no longer second-class citizens.