ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps
Xapian - Xapian is an open source probabilistic information retrieval library, released under the GNU...
Little Green Light - Illuminating Data. Advancing Nonprofits.
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.
Agilon One - Agilon One is a Nonprofit CRM software solution that connects and gathers information on constituents.