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.
GoPad for Schools - School Management
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Sawyer - Discover a wonder-filled world of kids classes, camps, events, and activities, right in your neighborhood
Swiftype Site Search - Swiftype Site Search helps to sell more, get the right answer to more people on the platform and surface relevant content for readers and followers.
Yusp - Yusp is a next generation, real-time personalization engine having all product modules as defined by Gartner for various business models.