Xapian is a free and open-source probabilistic information retrieval library, released under the GNU General Public License (GPL).[2] It is a full-text search engine library for programmers.
Meilisearch: Unified Search & AI Retrieval Platform
Build lightning-fast search and AI retrieval with Meilisearch. Open-source, developer-friendly search engine trusted by 20,000+ teams worldwide.
Spacedrive — A local-first data engine for everything you own
Index any data source. Search everything from one place. Keep it on your machine.
Google for Developers Blog - News about Web, Mobile, AI and Cloud
Explore LangExtract: a Gemini-powered, open-source Python library for reliable, structured information extraction from unstructured text with precise source grounding.
DITA Open Toolkit
The open-source publishing engine for content authored in the Darwin Information Typing Architecture
lexidex
This is a web index of atproto data and API schemas: Lexicons. It is an ✨Experimental✨ project from the protocol team at Bluesky.
PeARS - the People's Search Engine
PeARS is an open-source, curated search engine that lets you take control of your search. It has privacy and energy efficiency at its core.
kerim/zotero-mcp-skill
Claude Desktop skill for comprehensive, multi-strategy searching of Zotero libraries via MCP server with semantic search
ParadeDB — Search without a second system
One Postgres for your application data, full-text search, vector retrieval, and aggregations. Home of the pg_search extension.
The Cypherpunk Library
A personal collection of good public-domain reads. Free to read, free to keep.
readme.club - Community-driven resource sharing for Xteink users
Share and discover language files, documentation, tools, wallpapers, feature requests, and more
Introducing the Elicit API - Elicit
Search our 138M+ papers and generate Reports using our API.
Semble: Fast and Accurate Code Search for Agents
Fast and Accurate Code Search for Agents. Uses ~98% fewer tokens than grep+read
A Former Google Engineer Built a Search Engine for Finding Every Privacy Violation You Face Online
Former Google engineer Tim Libert is releasing a search engine, webXray, that aims to find illicit online data collection and tracking—with the goal of becoming “the Henry Ford of tech lawsuits.”
Parallel Web Systems | Infrastructure for intelligence on the web
Parallel's new FindAll API turns natural language queries into custom datasets from the web. It finds entities like companies, people, or locations based on your criteria, then enriches them with structured data—all with citations. FindAll Pro achieves 61% recall, 3x better than competitors.
Community Search Engines
The Age of PageRank is Over
Informatics of the Oppressed
Peer Knowledge Assisted Search Using Community Search Logs
A survey of community search over big graphs
Remembering the pre-Google web, when search was an experiment
Curated vs open search (by Ronen Tamari) — Semble