8 open source AI search and retrieval infrastructure. All have a free plan. Half of the paid plans start at $49 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 |
|---|---|---|---|---|---|
| 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 |
| ExaSearch API that ranks the web by meaning for AI agents and retrieval pipelines, with Lite, Auto and Deep search modes, an asynchronous research Agent and an official MCP server. A free Starter plan with monthly credits needs no payment method. | $49/mo | Yes | Web | 4.0 | 12 Nov |
| LanceDBOpen-source embedded retrieval library with a distributed Enterprise lakehouse on the same Lance format; its GitHub repository shows 11.9k stars. | -- | Yes | Web | 3.6 | 12 Nov |
| Mem0Memory layer for AI agents: an Apache-2.0 SDK, a managed Platform and an MCP server, with a free plan and 68.8k GitHub stars. | -- | Yes | Web | 3.6 | 11 Nov |
| ZeroxZerox is a free, MIT-licensed library that turns PDFs and 26+ document formats into clean markdown using vision models like GPT-4o, though development appears to have stalled. | Free | Yes | -- | 3.2 | 18 Sep |
| 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 |
| FirecrawlWeb data API for AI agents: search, scrape, crawl and interact, returning LLM-ready Markdown. Open source core with a free plan and an MCP server. | $16/mo | Yes | Web | -- | 3 Oct |
| 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 |
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