github.com
Mwmbl is an open source, non-profit web search engine that operates without ads, tracking or profit motive, and aims to serve as a replacement for commercial search engines. The project uses a centralized index with distributed volunteer-run web crawling, and community members determine search result rankings. Volunteers can contribute by running a command line crawler or installing a Firefox extension to help evaluate search ranking performance. Official documentation is available at https://book.mwmbl.org.