ACDSee - ACDSee is an image viewer that uses very little system resources, and it has a small, sleek size that won't take up much space on your system.
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.
digiKam - Professional Photo Management with the Power of Open Source
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Flickr - image and video hosting website
Klevu - Klevu offers instant site search solution for eCommerce stores.