ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.

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.

Xapian - Xapian is an open source probabilistic information retrieval library, released under the GNU...

SchoolAuction.net - SchoolAuction.net is a web-based software to help school auction teams plan, manage and run school fundraising auctions.

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.

BiddingOwl.com - BiddingOwl.com provides non-profits with auction management tools and helps to acheive fundraising goals.