CiviCRM - A Constituent relationship management for the Civic Sector
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
EspoCRM - EspoCRM is open source CRM (Customer Relationship Management) software that allows you to see, enter and evaluate all your company relationships regardless of the type.
restdb.io - restdb.io lets you create databases and REST APIs quickly. Development databases are free. Powerful web-based and mobile-friendly data management.
Pipeliner CRM - Pipeliner CRM empowers small to medium-sized sales teams to close more deals and lower risk. Implementation and training are a breeze. Mac & Windows.
RemoteStorage - An open protocol for per-user storage OWN YOUR DATA