Algolia - Algolia's Search API makes it easy to deliver a great search experience in your apps & websites. Algolia Search provides hosted full-text, numerical, faceted and geolocalized search.
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
keezy - A colorful soundboard. Play with music.