Pick your nerfed tool. We list the open-source replacement that does the same job for $0 (or close to it). Manually curated, no affiliate links, no recommendations driven by anything except actual fit.

Star counts are approximate, refreshed weekly via the GitHub API. List last human-reviewed 2026-05-09. Suggest an addition or correction: open a PR.

• Stable Diffusion WebUI (Automatic1111) ↗

  FREE / OSSAGPL-3.0★ 145k

  Default Midjourney replacement if you have a GPU. Largest community + extension library.

  Most-used SD frontendMassive extension ecosystemimg2img, ControlNet, LoRA training
  install: git clone, run webui-user.bat / webui.sh

  caveat: Needs 8GB+ VRAM for usable speeds. Setup is fiddly.
• Ollama ↗

  FREE / OSSMIT★ 130k

  Easiest way to run a local LLM. Pair with Open WebUI for full ChatGPT replacement.

  Run Llama/Mistral/Gemma/DeepSeek locallyOllama-compatible API for any clientBrew/winget/curl install
  install: brew install ollama && ollama run llama3.3

  caveat: Needs 16GB+ RAM for usable models. GPU strongly recommended.
• Open WebUI ↗

  FREE / OSSMIT★ 95k

  The default ChatGPT-replacement self-host. Massive ecosystem.

  ChatGPT-style web UI for any backend (Ollama, OpenAI-compatible)RAG with file uploadsFunction calling, web search plugin
  install: docker run -p 3000:8080 ghcr.io/open-webui/open-webui:main

  caveat: Best paired with Ollama running locally.
• ComfyUI ↗

  FREE / OSSGPL-3.0★ 65k

  When you want full control over the diffusion pipeline. Power-user choice.

  Node-based image/video pipelineSDXL, Flux, video diffusion modelsReproducible workflows you can share as JSON
  install: git clone + Python deps

  caveat: Steep learning curve vs A1111.
• AppFlowy AI ↗

  FREE / OSSAGPL-3.0★ 65k

  Notion + Notion AI in one self-hostable package.

  Open-source Notion alternativeAI features integratedSelf-host or desktop app
• Open Interpreter ↗

  FREE / OSSAGPL-3.0★ 60k

  ChatGPT's Code Interpreter, but local and against any model.

  Code Interpreter for any LLM, locallyFile ops + shell + browser controlPython-first but multi-language
  install: pip install open-interpreter

  caveat: AGPL — be careful if integrating into proprietary product.
• LobeChat ↗

  FREE / OSSApache-2.0★ 55k

  Slickest UI of the open-source chat clones.

  Polished chat UI with plugin storeMulti-provider (OpenAI/Anthropic/Gemini/local)Vision, voice, knowledge bases
  install: Vercel one-click deploy or docker compose

  caveat: Best with API-key access; some features paywall on hosted version.
• Fooocus ↗

  FREE / OSSGPL-3.0★ 42k

  If you want Midjourney's simplicity without ComfyUI's complexity.

  Midjourney-feel UX (one prompt, presets)Built-in style libraryMinimal config — just run
  install: Download zip, run run.bat / run.sh

  caveat: Less customizable than A1111/ComfyUI.
• OpenHands ↗

  FREE / OSSMIT★ 38k

  Open-source Devin. Best when you want autonomous multi-step coding agents you control.

  Sandboxed agent that runs full dev tasksWeb UI + CLI + headless modesPlug any LLM backend
  install: docker run docker.all-hands.dev/all-hands-ai/openhands:0.30

  caveat: Docker required. Heavier setup than CLI tools.
• Coqui TTS ↗

  FREE / OSSMPL-2.0★ 38k

  Production-grade TTS toolkit. Bigger than just one model.

  Mature TTS toolkit (XTTS v2)Fine-tune on your own voice1100+ language support via models
  caveat: Coqui Inc. shut down — community fork active.
• OpenHands (also covers v0/Bolt) ↗

  FREE / OSSMIT★ 38k

  Closest open-source v0/Bolt clone. Sandboxed agent that builds apps.

  Sandbox runs full coding tasks end-to-endBrowser + terminal + code-edit primitivesPlug any LLM
  install: Docker
• ChatTTS ↗

  FREE / OSSAGPL-3.0★ 35k

  Best free ElevenLabs replacement for English/Mandarin chat-style audio.

  Conversational TTS — handles fillers, pauses, multi-speakerMandarin + EnglishReal-time on consumer GPU
  caveat: AGPL.
• AnythingLLM ↗

  FREE / OSSMIT★ 32k

  When the use case is 'chat with my company docs' rather than general LLM.

  Workspace-based RAG over your docsDesktop or self-host20+ vector DB integrations
  install: Desktop app or Docker
• aider ↗

  FREE / OSSApache-2.0★ 28k

  Best Cursor replacement for terminal-comfortable devs who want auditable git history of every edit.

  CLI-first, terminal-nativeGit-aware: auto-commits, branches, diffsWorks with any LLM provider (BYO API key)Strong repo-map context
  install: pip install aider-chat

  caveat: BYO API key (Anthropic/OpenAI/local). No GUI.
• Jan ↗

  FREE / OSSAGPL-3.0★ 28k

  Easiest desktop ChatGPT replacement for non-technical users.

  Desktop app — no Docker, no terminalBuilt-in model marketplaceLocal-first, optional cloud
  install: Download from jan.ai

  caveat: AGPL. Mac/Win/Linux.
• LibreChat ↗

  FREE / OSSMIT★ 25k

  When you want ChatGPT's UX but as a self-hosted multi-user product.

  ChatGPT clone with multi-provider supportPlugins (DALL-E, Wolfram)Auth + multi-userConversation forking
  install: Docker compose

  caveat: Heavier setup than Open WebUI.
• Cline ↗

  FREE / OSSApache-2.0★ 24k

  Direct Cursor/Claude-Code clone inside VSCode. Best for devs already living in VSCode.

  VSCode extension, native UXPlan/Act mode toggleBuilt-in MCP supportPermission-based file ops
  install: VSCode marketplace: 'Cline'

  caveat: BYO API key. Permission prompts can feel noisy.
• Tabby ↗

  FREE / OSSApache-2.0★ 24k

  When you need 100% on-prem code completion. No data leaves your machine.

  Self-hosted, runs on your GPUOpenAPI-compatibleTeam collab features
  install: Docker image or Homebrew

  caveat: Requires GPU for decent latency. Setup is non-trivial.
• InvokeAI ↗

  FREE / OSSApache-2.0★ 24k

  Cleanest UI in the SD ecosystem. Best for design-pipeline use.

  Polished web UICanvas/inpainting workflowStudio-grade install experience
  install: Installer .exe / .pkg / launcher script
• Open-Sora ↗

  FREE / OSSApache-2.0★ 22k

  When you want OpenAI Sora capability locally. Heavy GPU need.

  Open-source video diffusion (Sora-style)Text-to-video and image-to-videoPublic model checkpoints
  caveat: Needs 24GB+ VRAM realistically.
• AudioCraft (MusicGen) ↗

  FREE / OSSMIT★ 22k

  Best free Suno/Udio alternative for music generation.

  Meta's music + audio generation toolkitText-to-music via MusicGenAudioGen for sound effects
  caveat: Output quality below Suno's; needs prompt engineering.
• Continue.dev ↗

  FREE / OSSApache-2.0★ 21k

  Best when you want local LLMs (via Ollama) and care about privacy. Strong autocomplete.

  VSCode + JetBrains supportLocal-model friendly (Ollama integration)Custom slash commandsTab autocomplete + chat
  install: VSCode/JetBrains marketplace: 'Continue'

  caveat: Tab autocomplete needs a fast local model or hosted API.
• Perplexica ↗

  FREE / OSSMIT★ 19k

  Direct Perplexity replacement. Free if you BYO API key.

  Open-source Perplexity cloneMultiple search modes (Academic, YouTube, Reddit)Self-host, BYO LLM + SearXNG
  install: Docker compose with SearXNG
• SearXNG ↗

  FREE / OSSAGPL-3.0★ 17k

  Use under Perplexica/Morphic for the search backend, or just as a private Google.

  Privacy-respecting meta-search engine70+ search backendsFoundation for AI search tools
  install: Docker
• Bolt.diy ↗

  FREE / OSSMIT★ 17k

  Direct Bolt.new replacement. Free if you bring your own API key.

  Open-source fork of Bolt.new (StackBlitz)WebContainers in browserBYO API key (any provider)
  install: git clone + npm install
• Goose ↗

  FREE / OSSApache-2.0★ 14k

  When you want a polished agent from a real engineering org. MCP-native.

  Block (Square)'s on-machine AI agentExtension marketplace (MCP servers)Fast, focused on dev workflows
  install: brew install block/goose/goose

  caveat: Newer than aider/Cline; ecosystem still growing.
• F5-TTS ↗

  FREE / OSSMIT★ 14k

  Voice cloning use case. MIT-licensed (rare for high-quality TTS).

  Voice cloning from a 10-second sampleMulti-languageStrong prosody
• Roo Code ↗

  FREE / OSSApache-2.0★ 11k

  Cline's multi-personality cousin. Pick when you want explicit Architect-vs-Coder separation.

  Cline fork with extra modes (Architect, Ask, Debug)Multi-mode workflowsCustom mode authoring
  install: VSCode marketplace: 'Roo Code'

  caveat: Same BYO-API-key model as Cline.
• Morphic ↗

  FREE / OSSApache-2.0★ 8.5k

  Lighter-weight Perplexica with prettier output.

  Generative UI search engineStreaming results with rich cardsVercel-deployable in 1 click
  caveat: Smaller community.
• Codeium ↗

  FREEMIUMfree tier

  Closest free-tier replacement for Copilot. No usage caps on free.

  Free tier with no token cap70+ language supportMulti-IDE (VSCode/JetBrains/Vim/Emacs)Self-host enterprise tier
  caveat: Closed-source on the free tier. Enterprise plan exists for self-host.
• Stable Video Diffusion ↗

  FREE / OSSStability Community License

  Best image-to-video model with permissive-enough license.

  Image-to-video model from StabilityRun via ComfyUI workflowFree for non-commercial; commercial license available
  caveat: Read the license — not pure open-source.