19 open source AI tools for Windows. All have a free plan. Half of the paid plans start at $29 a month or less. Newest check: 12 Nov 2026.
268 of 721 tools were checked against the vendor's own page in the last 30 days.
| Tool | Price from | Free plan | Runs on | Rating | Checked |
|---|---|---|---|---|---|
| QwenAlibaba's free Qwen chat app for web, desktop and mobile, plus a per-token Model Studio API and open-weight models you can self-host. | -- | Yes | Web · iOS · Android · Mac · Windows | 4.4 | 2 Nov |
| HeyClickyDesktop AI buddy for Mac and Windows that sees your screen on a hotkey, talks you through any app and runs agents you start by voice. Y Combinator Spring 2026. Free plan, plus Pro and Max. | $20/mo | Yes | Mac · Windows | 4.1 | 11 Nov |
| AlgoliaAI search and retrieval platform powering 1.75 trillion searches annually for 18,000+ businesses with semantic search, vector embeddings, and AI agents. | -- | Yes | Web · iOS · Android · Mac · Windows | 4.0 | 3 Sep |
| AtuinOpen-source shell history with encrypted sync across machines, plus Threads to search and resume coding-agent sessions (32.3k GitHub stars). | Free | Yes | Mac · Windows | 4.0 | 12 Nov |
| OllamaMIT-licensed runtime that runs open-weight LLMs on macOS, Windows and Linux with a local API, plus an optional paid cloud for larger models. | $20/mo | Yes | Web · Mac · Windows | 4.0 | 12 Nov |
| Mistral AIMistral AI is a Paris-based AI lab building open-weight foundation models such as Mistral Large 4 and the Vibe assistant, with EU-hosted infrastructure. | $14.99/mo | Yes | Web · iOS · Android · Mac · Windows | 3.9 | 10 Oct |
| CodagCuts AI coding-agent costs by trimming oversized tool results, from test runs to grep output, down to the lines that matter, with the rest kept on your machine. | $499/mo | Yes | Mac · Windows | 3.5 | 9 Nov |
| AiderFree, open-source terminal pair programmer that edits your git repo and commits each change; bring your own LLM key. 49,000+ GitHub stars. | Free | Yes | Mac · Windows | -- | 3 Oct |
| AnythingLLMFree MIT-licensed desktop app that chats with your documents and runs agents on local models, no account needed. About 66,700 GitHub stars. | $50/mo | Yes | Web · Android · Mac · Windows | -- | 6 Oct |
| BAMLBAML is a free, open-source (Apache-2.0) language with 9,000+ GitHub stars for building type-safe, testable structured LLM outputs and agents. | -- | Yes | Web · Mac · Windows | -- | 17 Aug |
| DeeplakeActiveloop's open-source GPU database for AI agents: Postgres interface, multimodal data lake, SOC 2 Type II certified, Apache-licensed core. | $99/mo | Yes | Web · Mac · Windows | -- | 8 Oct |
| GPT4AllFree MIT-licensed desktop app that runs open-weight LLMs offline, with LocalDocs chat over your own folders. About 77K GitHub stars. | Free | Yes | Mac · Windows | -- | 6 Oct |
| JanOpen-source desktop app that runs open LLMs offline on Windows, macOS and Linux, with optional cloud models through your own API keys. | Free | Yes | Mac · Windows | -- | 6 Oct |
| LangChainObserve, evaluate, and deploy reliable AI agents | $39/mo | Yes | Web · Mac · Windows | -- | 29 Sep |
| LiteLLMOpen-source AI gateway and Python SDK that puts 100+ LLM providers behind one OpenAI-compatible API, with budgets and fallbacks. Free to self-host. | -- | Yes | Web · Mac · Windows | -- | 23 Oct |
| llama.cppFree MIT-licensed C/C++ engine that runs LLMs locally. 130,000+ GitHub stars, GGUF models, OpenAI-compatible server. A developer tool. | Free | Yes | Mac · Windows | -- | 7 Oct |
| MastraOpen-source TypeScript framework for building AI agents and workflows, routing to 90+ model providers through one interface. | $250/mo | Yes | Web · Mac · Windows | -- | 19 Aug |
| Resemble AIGenerative voice AI and deepfake detection for enterprise trust | $29/mo | Yes | Web · Mac · Windows | -- | 19 Aug |
| RiffusionFree AI music generator that creates instrumental tracks from text prompts in 30–45 seconds, no login required. | $8/mo | Yes | Web · Mac · Windows | -- | 19 Aug |
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