Splice - Music creation, collaboration, and sharing made simple.
Apache Lucene - High-performance, full-featured text search engine library written entirely in Java.
AppWise - AppWise is an intelligent workspace that unifies enterprise apps into a single, searchable view.
Six Degrees of Wikipedia - Find the shortest path between two subjects
Render UIKit - React-inspired Swift library for writing UIKit UIs
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.