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.
3D Hubs - Airbnb for 3D printing
Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
Muglaunch.com - Design and sell print on demand products easily @ Muglaunch
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Zazzy - Design and sell your own 3D printed jewelry