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Best Free and Open Source AI Tools 2025

ByCyber Wolf

Open-source AI tools provide powerful, cost-free alternatives for developers, researchers, and enthusiasts looking to integrate AI into their workflows. 

This guide highlights some of the best free and open-source AI tools across various categories, including development frameworks, automation, image and video generation, text-to-speech, and more.

Development Frameworks and UI

  • Pinokio: Run and install AI apps on your computer with one click
  • Open Web UI: Platform for running large language models
  • ComfyUI: Software for running open source image and video generation models
  • Ollama: Run large language models locally

Programming

  • Cline: Open-source Cursor alternative with custom API key support.
  • Roo Code: Fork of Cline with various additional features.
  • Aider: Open source AI assistant in your CLI similar to Cline.

AI Agents and Automation

  • AutoGPT: An experimental open-source attempt to make fully autonomous agents
  • CrewAI: Open-source framework for orchestrating AI agents
  • Flowise: Platform for creating AI apps and chatbots
  • Fabric: Framework for automating tasks
  • Onyx: AI Assistant that connects to company docs, apps, and people, with enterprise search across platforms like Slack and Google Drive
  • Leon: Open source AI assistant

Video Generation

  • Tencent Hunyuan: Currently one of the highest quality open source video generation models
  • Open-Sora-Plan: Open-source effort to replicate OpenAI’s Sora video generation model
  • Stable Video: Stability AI’s text-to-video generation model
  • Mochi: High-quality video generation model from Genmo
  • CogVideo: Open-source text-to-video generation model
  • Pyramid Flow: Video generation model with focus on motion control
  • SamurAI GPT Text-To-Video: Specialized tool for creating text-to-speech videos with captions
  • Deep Live Cam: Realtime face swap and video deep fake generator
  • Short-GPT: Framework for generating shorts videos for YouTube and TikTok1

Research

  • Perplexica: AI-powered search engine, open source alternative to Perplexity

Text to Speech

  • VOICEVOX: Japanese open-source text-to-speech engine
  • Kokoro: Open-source text-to-speech model for English voices
  • Coqui TTS: Text-to-speech library
  • F5-TTS: Open-source text-to-speech engine

Image Generation and Editing

3D and Design Tools

  • TRELLIS: AI-powered 3D modeling and automation tool
  • Excalidraw: Virtual collaborative whiteboard tool

Hugging Face Spaces

These Hugging Face spaces allow you to run various open source models for free, though you may experience waiting times between generations:

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