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.
Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
Klevu - Klevu offers instant site search solution for eCommerce stores.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.