Sharetribe - Build your online marketplace business. You don't need a developer.
Site Search 360 - Site Search 360 enhances and improves your built-in CMS or product search with autocompletion, semantic search, filters, facets, detailed analytics, and a whole lot of customization options.
Arcadier - Build an online marketplace in minutes, no coding required.
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.
IZBERG - IZBERG provides mid-size and global B2C and B2B companies with solutions to create scalable and flexible online marketplace.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.