ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
GiveSmart - GiveSmart offers mobile bidding and event management for charity fundraisers .
Xapian - Xapian is an open source probabilistic information retrieval library, released under the GNU...
Silent Auction Pro - Simple * Affordable * Powerful --- Silent Auction Pro is a multi-user, internet-based fundraising software system providing complete donor and auction management solution for charitable organizations.
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.
OneCause - Fundraising auction & event management software