Sorted by GitHub stars (fetched from the GitHub API on 17 Oct 2026). Setup difficulty: 1 = install an app, 5 = needs a GPU server and ops skills. "Custom / see repo" means GitHub can't classify the licence (often fair-code or open-core); check the repo before using commercially.
AI coding assistant
Best for: Developers who want a model-agnostic terminal agent
Open-source AI coding agent for the terminal, IDE and desktop that works with any model provider.
Free planOpen source · MIT
Free and open source
Checked 18 Oct 2026 · source (OpenCode pricing source, opens in a new tab)
Free and open source; free models included, or connect any provider
★ 215.0k · MIT · Setup 2/5 · repo (OpenCode GitHub repository)
Local AI
Best for: Developers running models on their own machine
Run open-weight LLMs locally from the command line.
Free planOpen source · MITSelf-hostable
From $20/mo billed monthly · free plan
Checked 18 Oct 2026 · source (Ollama pricing source, opens in a new tab)
Free (run models locally); Pro $20/mo or $200/yr ($16.67/mo billed annually); Max $100/mo; Team $500/mo (early access)
★ 183.6k · MIT · Setup 2/5 · repo (Ollama GitHub repository)
AI image generation
Best for: Hobbyists with a GPU
Popular open-source web UI for running Stable Diffusion locally.
Free planOpen source · AGPL-3.0Self-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (Stable Diffusion WebUI (AUTOMATIC1111) pricing source, opens in a new tab)
Free and open source (self-host)
★ 165.1k · AGPL-3.0 · Setup 4/5 · repo (Stable Diffusion WebUI (AUTOMATIC1111) GitHub repository)
AI image generation
Best for: Advanced users building custom image pipelines
Node-based open-source UI for image and video diffusion models.
Free planOpen source · GPL-3.0Self-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (ComfyUI pricing source, opens in a new tab)
Free and open source (self-host)
★ 138.0k · GPL-3.0 · Setup 4/5 · repo (ComfyUI GitHub repository)
Transcription
Best for: Developers self-hosting transcription
Open-source speech recognition model.
Free planOpen source · MITSelf-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (Whisper (OpenAI) pricing source, opens in a new tab)
Free and open source (self-host)
★ 110.8k · MIT · Setup 3/5 · repo (Whisper (OpenAI) GitHub repository)
AI coding assistant
Best for: Developers who want a free terminal agent from Google
Google's open-source AI agent for the terminal, powered by Gemini.
Free planOpen source · Apache-2.0
Free and open source (Apache-2.0)
Checked 18 Oct 2026 · source (Gemini CLI pricing source, opens in a new tab)
Free and open source (Apache-2.0); sign in with a Google account or use a Gemini API key (usage-based)
★ 107.4k · Apache-2.0 · Setup 2/5 · repo (Gemini CLI GitHub repository)
AI code editor
Best for: Developers who value speed
Fast, open-source code editor with built-in AI features.
Free planOpen source · GPL-3.0-or-later
From $10/mo billed monthly · free plan
Checked 18 Oct 2026 · source (Zed pricing source, opens in a new tab)
Free personal plan; Pro $10/mo
★ 91.9k · GPL-3.0-or-later · Setup 1/5 · repo (Zed GitHub repository)
AI coding agent
Best for: Teams wanting an open-source Devin-style agent
Open-source autonomous software-engineering agent you can run locally, self-host or use in the cloud.
Free planOpen source · MITSelf-hostable
Free open-source local version
Checked 18 Oct 2026 · source (OpenHands pricing source, opens in a new tab)
Free open-source local version; cloud Individual plan free with your own API key or at-cost models
★ 91.1k · MIT · Setup 3/5 · repo (OpenHands GitHub repository)
AI workspace
Best for: Teams that want a self-hostable Notion
Open-source Notion alternative with AI features.
Free planOpen source · AGPL-3.0Self-hostable
From $12/mo billed annually · free plan
Checked 18 Oct 2026 · source (AppFlowy pricing source, opens in a new tab)
Free Personal plan; Pro $12/member/mo (billed annually)
Starting price $12/mo is billed annually
★ 77.5k · AGPL-3.0 · Setup 3/5 · repo (AppFlowy GitHub repository)
AI coding assistant
Best for: Developers who want control over models and costs
Open-source autonomous coding agent for VS Code; bring your own API key.
Free planOpen source · Apache-2.0
Free and open source
Checked 18 Oct 2026 · source (Cline pricing source, opens in a new tab)
Free and open source
★ 70.5k · Apache-2.0 · Setup 2/5 · repo (Cline GitHub repository)
Design
Best for: Teams wanting a self-hostable Figma alternative
Open-source design and prototyping platform.
Free planOpen source · MPL-2.0Self-hostable
From $7/mo billed monthly · free plan
Checked 18 Oct 2026 · source (Penpot pricing source, opens in a new tab)
Free (cloud or self-host); Unlimited $7/editor/mo (capped at $175/mo); Enterprise $25/member/mo
★ 61.3k · MPL-2.0 · Setup 3/5 · repo (Penpot GitHub repository)
Project management
Best for: Teams wanting a self-hostable Trello or Jira
Open-source project tracker (a Jira/Linear alternative) with AI, in the cloud or self-hosted.
Free planOpen source · AGPL-3.0Self-hostable
From $6/mo billed monthly · free plan
Checked 18 Oct 2026 · source (Plane pricing source, opens in a new tab)
Free plan; Pro $6/seat/mo; Business $13/seat/mo
★ 61.0k · AGPL-3.0 · Setup 3/5 · repo (Plane GitHub repository)
AI agents
Best for: Builders prototyping AI agents visually
Open-source drag-and-drop builder for LLM agents.
Free planOpen source · Apache-2.0Self-hostable
From $35/mo billed monthly · free plan
Checked 18 Oct 2026 · source (Flowise pricing source, opens in a new tab)
Free cloud plan; Starter $35/mo; Pro $65/mo
★ 55.5k · Apache-2.0 · Setup 3/5 · archived · repo (Flowise GitHub repository)
Automation
Best for: Tinkerers self-hosting automation
Open-source agents that monitor and act on your behalf.
Free planOpen source · MITSelf-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (Huginn pricing source, opens in a new tab)
Free and open source (self-host)
★ 50.1k · MIT · Setup 4/5 · repo (Huginn GitHub repository)
AI coding assistant
Best for: Terminal-first developers
Open-source AI pair programming in your terminal.
Free planOpen source · Apache-2.0
Free and open source
Checked 18 Oct 2026 · source (Aider pricing source, opens in a new tab)
Free and open source
★ 49.6k · Apache-2.0 · Setup 2/5 · repo (Aider GitHub repository)
AI voice
Best for: Developers self-hosting TTS
Open-source deep-learning text-to-speech toolkit.
Free planOpen source · MPL-2.0Self-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (Coqui TTS pricing source, opens in a new tab)
Free and open source (self-host)
★ 46.1k · MPL-2.0 · Setup 4/5 · repo (Coqui TTS GitHub repository)
Self-hosted AI chat
Best for: Teams consolidating many AI providers in one UI
Open-source multi-provider chat UI with agents and plugins.
Free planOpen source · MITSelf-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (LibreChat pricing source, opens in a new tab)
Free and open source (self-host)
★ 45.9k · MIT · Setup 3/5 · repo (LibreChat GitHub repository)
Notes & knowledge
Best for: Obsidian users who prefer outlining
Open-source, privacy-first outliner for notes and knowledge graphs, stored as local Markdown files.
Free planOpen source · AGPL-3.0
Free forever for personal use (open source)
Checked 18 Oct 2026 · source (Logseq pricing source, opens in a new tab)
Free forever for personal use (open source)
★ 45.3k · AGPL-3.0 · Setup 1/5 · repo (Logseq GitHub repository)
Local AI
Best for: Users who want offline, private AI chat
Open-source desktop ChatGPT alternative that runs 100% offline.
Free planOpen source · Apache-2.0Self-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (Jan pricing source, opens in a new tab)
Free and open source (self-host)
★ 45.0k · Apache-2.0 · Setup 1/5 · repo (Jan GitHub repository)
Customer support
Best for: Teams wanting a self-hosted Intercom/Zendesk
Open-source customer engagement suite with AI.
Free planOpen source · MITSelf-hostable
From $19/mo billed monthly · free plan
Checked 18 Oct 2026 · source (Chatwoot pricing source, opens in a new tab)
Free Hacker plan (2 agents); Startups $19/agent/mo; Business $39/agent/mo
★ 37.9k · MIT · Setup 3/5 · repo (Chatwoot GitHub repository)
AI coding assistant
Best for: Teams wanting a customisable open-source assistant
Open-source AI code assistant for VS Code and JetBrains.
Acquired · no longer maintainedFree planOpen source · Apache-2.0
Free and open source (no longer maintained)
Checked 18 Oct 2026 · source (Continue pricing source, opens in a new tab)
Free and open source (no longer maintained)
★ 36.2k · Apache-2.0 · Setup 2/5 · repo (Continue GitHub repository)
AI companions
Best for: Power users who want full control of characters
Open-source, self-hosted front end for AI role-play chat.
Free planOpen source · AGPL-3.0Self-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (SillyTavern pricing source, opens in a new tab)
Free and open source (self-host)
★ 34.6k · AGPL-3.0 · Setup 3/5 · repo (SillyTavern GitHub repository)
Automation
Best for: Teams wanting a self-hosted Zapier
Open-source Zapier alternative with AI agents.
Free planOpen source · MITSelf-hostable
From $20/mo billed monthly · free plan
Checked 18 Oct 2026 · source (Activepieces pricing source, opens in a new tab)
Free plan; Plus $20/mo flat; Team $200/mo flat
★ 25.1k · MIT · Setup 3/5 · repo (Activepieces GitHub repository)
Email marketing
Best for: Developers who want to self-host newsletters cheaply
Self-hosted, open-source newsletter and mailing-list manager.
Free planOpen source · AGPL-3.0Self-hostable
Free and open source (AGPLv3), self-hosted
Checked 18 Oct 2026 · source (listmonk pricing source, opens in a new tab)
Free and open source (AGPLv3), self-hosted
★ 23.8k · AGPL-3.0 · Setup 3/5 · repo (listmonk GitHub repository)
AI music
Best for: Researchers and developers
Meta's open-source MusicGen and AudioGen models.
Free planOpen source · MITSelf-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (AudioCraft (Meta) pricing source, opens in a new tab)
Free and open source (self-host)
★ 23.7k · MIT · Setup 4/5 · repo (AudioCraft (Meta) GitHub repository)
Screen recording
Best for: Makers who want a free, open-source Loom
Open-source Loom alternative for recording and sharing your screen.
Free planOpen source · AGPL-3.0
From $8.16/mo billed annually · free plan
Checked 18 Oct 2026 · source (Cap pricing source, opens in a new tab)
Free for personal use; Desktop License $29/yr or $58 lifetime; Cap Pro $12/user/mo ($8.16 billed annually)
Starting price $8.16/mo is billed annually
★ 23.4k · AGPL-3.0 · Setup 1/5 · repo (Cap GitHub repository)
AI app builder
Best for: Vibe coders who want a local Lovable-style tool
Free, local, open-source AI app builder.
Free planOpen source · Apache-2.0
From $20/mo billed monthly · free plan
Checked 18 Oct 2026 · source (Dyad pricing source, opens in a new tab)
Free & open-source app; Dyad Pro $20/mo
★ 22.0k · Apache-2.0 · Setup 2/5 · repo (Dyad GitHub repository)
AI app builder
Best for: Developers who want Bolt with their own models
Open-source, self-hosted version of Bolt that works with any LLM.
Free planOpen source · MITSelf-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (bolt.diy pricing source, opens in a new tab)
Free and open source (self-host)
★ 20.0k · MIT · Setup 3/5 · repo (bolt.diy GitHub repository)
Automation
Best for: Engineering teams building internal automations
Open-source developer platform for scripts, workflows and UIs.
Free planOpen source · AGPL-3.0Self-hostable
Enterprise from $120/mo · free plan
Checked 18 Oct 2026 · source (Windmill pricing source, opens in a new tab)
Free & open-source (self-host); Enterprise from $120/mo
★ 18.2k · AGPL-3.0 · Setup 4/5 · repo (Windmill GitHub repository)
AI writing assistant
Best for: Multilingual writers
Multilingual grammar and style checker, with an open-source core.
Free planOpen source · LGPL-2.1Self-hostable
India price (INR) · USD price not available
Premium ₹999/mo monthly or ₹3,499/yr (India pricing) · free plan
Checked 18 Oct 2026 · source (LanguageTool pricing source, opens in a new tab)
Free plan; Premium ₹999/mo monthly or ₹3,499/yr (India pricing)
★ 15.2k · LGPL-2.1 · Setup 3/5 · repo (LanguageTool GitHub repository)
AI voice
Best for: Home-automation and offline voice projects
Fast, local open-source neural text-to-speech.
Free planOpen source · MITSelf-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (Piper pricing source, opens in a new tab)
Free and open source (self-host)
★ 11.3k · MIT · Setup 3/5 · archived · repo (Piper GitHub repository)
AI presentations
Best for: Developers wanting a self-hosted Gamma
Open-source, self-hostable AI presentation generator.
Free planOpen source · Apache-2.0Self-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (Presenton pricing source, opens in a new tab)
Free and open source (self-host)
★ 11.2k · Apache-2.0 · Setup 3/5 · repo (Presenton GitHub repository)
Marketing automation
Best for: Teams wanting a self-hosted marketing automation suite
Open-source marketing automation: email, segments, campaigns and landing pages.
Free planOpen source · GPL-3.0Self-hostable
Free and open source (self-host)
Checked 18 Oct 2026 · source (Mautic pricing source, opens in a new tab)
Free and open source (self-host)
★ 10.8k · GPL-3.0 · Setup 4/5 · repo (Mautic GitHub repository)
Image editing
Best for: Digital painters
Free, open-source painting program.
Free planOpen source · GPL-3.0
Free and open source
Checked 18 Oct 2026 · source (Krita pricing source, opens in a new tab)
Free and open source
★ 10.6k · GPL-3.0 · repo (Krita GitHub repository)
Image editing
Best for: Budget users comfortable with a learning curve
Free, open-source image editor.
Free planOpen source · GPL-3.0-or-later
Free and open source
Checked 18 Oct 2026 · source (GIMP pricing source, opens in a new tab)
Free and open source
★ 6.5k · GPL-3.0-or-later · repo (GIMP GitHub repository)
Video editing
Best for: Budget editors on Linux/Windows/Mac
Free, open-source desktop video editor.
Free planOpen source · GPL-3.0
Free and open source
Checked 18 Oct 2026 · source (Kdenlive pricing source, opens in a new tab)
Free and open source
★ 5.9k · GPL-3.0 · Setup 2/5 · repo (Kdenlive GitHub repository)