Apache UserGrid - Usergrid is an open-source BaaS enabling developers to rapidly build web and/or mobile applications.
Zenefits - All-In-One Online HR: Payroll | Benefits | Compliance
Baqend Platform - Baqend is a Backend-as-a-Service for web and mobile apps.
WageWorks - WageWorks provides consumer-directed benefits for pretax commuter and health accounts.
ApiOmat - ApiOmat is a Mobile Backend as a Service enabling organizations to integrate their enterprise IT systems with mobile devices and wearables.
Insperity - Insperity takes care of your HR needs by managing employee benefits, payroll proccessing, and much more.