21 open source AI infrastructure tools. 19 have a free plan. Half of the paid plans start at $15 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 |
|---|---|---|---|---|---|
| OSSInsightOSSInsight is a free AI-powered GitHub analytics platform by PingCAP analyzing 10+ billion open source events to surface trends, rankings, and developer insights across the ecosystem. | Free | Yes | Web | 4.1 | 20 Sep |
| GroqFast open-model inference, now built on NVIDIA-licensed LPU hardware | Free | Yes | Web | 4.0 | 6 Sep |
| Hugging FaceThe AI community building the future. Platform for discovering, sharing and collaborating on machine learning models, datasets and applications. | $9/mo | Yes | Web | 4.0 | 19 Aug |
| 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 |
| Cast.aiCast.ai cuts Kubernetes cloud costs 50-70% using automated rightsizing and Spot instance management. Trusted by 2,100+ companies, reached $1B unicorn in 2026. | -- | Yes | Web | 3.8 | 19 Aug |
| ExecutorMIT licensed MCP gateway with 4.3k GitHub stars that connects Claude Code, Codex and Cursor to your accounts and hosts the tools agents write. | $15/mo | Yes | Web | 3.2 | 29 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 |
| CactusOpen-source engine that runs LLM, speech and vision models on phones and wearables, with 6 language bindings and cloud handoff. | Free | Yes | iOS · Android · Mac | -- | 14 Oct |
| fast.aifast.ai is a free nonprofit deep learning course reaching 500,000+ students with practical top-down teaching and open-source fastai library. | Free | Yes | Web | -- | 19 Aug |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| Together AIThe AI Native Cloud: a full-stack platform for training, fine-tuning, and deploying open-source AI models | -- | Trial | Web | -- | 5 Oct |
| 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 |
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