restdb.io - restdb.io lets you create databases and REST APIs quickly. Development databases are free. Powerful web-based and mobile-friendly data management.
Pipedrive - Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Zoho CRM - Omnichannel CRM for Businesses of all sizes
RemoteStorage - An open protocol for per-user storage OWN YOUR DATA
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.