OpenSearch - OpenSearch is a community-driven, open source search and analytics suite derived from Apache 2.0 licensed Elasticsearch 7.10.2 & Kibana 7.10.2. It consists of a search engine daemon, and a visualization and user interface, OpenSearch Dashboards.
Endless - Random and amazing Wikipedia articles.
Sphinx Search - Sphinx is an open source full text search server, designed with performance, relevance (search quality), and integration simplicity in mind. Sphinx lets you either batch index and search data stored in files, an SQL database, NoSQL storage.
Wiki Reverse - See what websites are linking to Wikipedia pages
Apache Lucene - High-performance, full-featured text search engine library written entirely in Java.
Pathica - Find a path to connect with anyone on Instagram.