Best Open Source AI Chat in 2026

Conversational AI assistants and chatbot tools for answering questions, generating content, and automating tasks.

3 open source ai chat — ranked by GitHub stars. Browse all

Ollama

Get up and running with Llama 3.3, DeepSeek-R1, Phi-4, Gemma 3, Mistral Small 3.1 and other large language models.

Alternative to:

ChatGPT

Open WebUI

User-friendly AI Interface (Supports Ollama, OpenAI API, ...)

Alternative to:

ChatGPT

Lobe Chat

🤯 Lobe Chat - an open-source, modern design AI chat framework. Supports multiple AI providers (OpenAI / Claude 4 / Gemini / DeepSeek / Ollama / Qwen), Knowledge Base (file upload / RAG ), one click install MCP Marketplace and Artifacts / Thinking. One-click FREE deployment of your private AI Agent application.

Alternative to:

ChatGPT