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.
Envoy - Visitor registration that's changing how guests are greeted in companies around the world.
Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
The Receptionist - The Receptionost is a visitor managemnt solution that has visitor logging system to track visitor traffic.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
TractionGuest - Safe, secure workplace for all.