75 open source AI tools. 70 have a free plan. Half of the paid plans start at $25 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 |
|---|---|---|---|---|---|
| LangChainObserve, evaluate, and deploy reliable AI agents | $39/mo | Yes | Web · Mac · Windows | -- | 29 Sep |
| LettaOpen-source agent platform from the MemGPT team. Agents remember across chats, run in a CLI, web app or SDK, and reply on Slack, Telegram and more. | $20/mo | Yes | Web | -- | 26 Oct |
| 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 |
| LlamaIndexThe world's most accurate agentic OCR and document-specific AI workflows for enterprise automation | Free | Yes | Web | -- | 19 Aug |
| MaleCNS ConnectomeFree connectome of 166,000+ neurons across an entire male Drosophila nervous system, from HHMI Janelia and Google Research. | Free | Yes | Web | -- | 14 Oct |
| MarsXMarsX is a free AI-powered no-code and low-code platform with thousands of reusable Micro-Apps that reduces development time by 90% for building web and mobile apps. | Free | Yes | Web · iOS · Android | -- | 9 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 |
| MiroFishOpen-source app that simulates thousands of LLM personas reacting on mock social networks to rehearse public response. Self-hosted, AGPL-3.0 licensed. | Free | Yes | Web | -- | 27 Oct |
| n8nAI workflow automation platform for technical teams | -- | Yes | Web | -- | 26 Aug |
| NuMindNuMind's NuExtract API pulls structured JSON from PDFs and scans, claiming a 9-point F-score edge over GPT-4.1 on its own extraction benchmark. | -- | Yes | Web | -- | 25 Aug |
| Open WebUISelf-hosted browser chat for Ollama and OpenAI-compatible models, adding retrieval, plugins and user roles. Free software, about 154K GitHub stars. | -- | Yes | Web | -- | 6 Oct |
| OvermindOpen-source platform that turns AI agent traces into scored datasets and LoRA or full fine-tunes of open models from 230M parameters up, with weights you keep. | $120/mo | Yes | Web | -- | 27 Oct |
| ReplicateRun open-source AI models via API without managing any GPU infrastructure. | Free | Yes | Web | -- | 21 Aug |
| Resemble AIGenerative voice AI and deepfake detection for enterprise trust | $29/mo | Yes | Web · Mac · Windows | -- | 19 Aug |
| Rev AISpeech-to-text API transcribing at $0.003/minute across 58+ languages, trained on 3M+ hours with optional human transcription at $1.99/minute for 99%+ accuracy. | $25.49/mo | Yes | Web | -- | 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 |
| SkillyOpen-source Mac app that listens to your question, answers by voice and moves a pointer to the right button, in any app or browser tab. | $5/mo | Yes | Web · Mac | -- | 28 Oct |
| Stability AIEnterprise-ready creative partner for multimodal AI media generation | $19/mo | Yes | Web | -- | 2 Sep |
| SuperAGIOpen-source autonomous AI agent framework and AI Super App for work, backed by $15M. Lets dev teams build, deploy, and manage multi-agent workflows with a built-in CRM and AI SDR. | $49/mo | Yes | Web | -- | 19 Aug |
| TiptapOpen source rich text editor framework backed by a 6,000-member Discord community; Tiptap Cloud adds AI-agent editing and paid collaboration plans. | $59/mo | Yes | Web | -- | 31 Aug |
| Together AIThe AI Native Cloud: a full-stack platform for training, fine-tuning, and deploying open-source AI models | -- | Trial | Web | -- | 5 Oct |
| LLMStackNo-code AI agent and workflow builder connecting LLM models to your data. Integrates OpenAI, Cohere, and Hugging Face, with a free tier and paid production plans. Deploy to the cloud or self-host on-premise. | $50/mo | Yes | Web | 3.3 | 24 Sep |
| OpenPipeFine-tuning platform whose hosted service ended in July 2026 after CoreWeave moved it to W&B; the ART library stays open source. | -- | -- | Web | -- | 13 Oct |
| Play.ht[DISCONTINUED] Play.ht was an AI text-to-speech platform with 900+ voices in 142 languages. Meta acquired the company in 2025 and shut it down completely by year's end. See TechCrunch and Meta's official announcement for proof. | $39/mo | Yes | Web · iOS · Android | -- | 19 Aug |
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