There's plenty of lists of BaaS offerings out there, but some of them have since disappeared/consolidated. So here's a list based on my findings as of today:

Commercial offerings

• App24
• Google Datastore
• Orchestrate
• Parse
• Amazon DynamoDB
• Kumulos
• Dream Factor

Open Source Solutions

• BaasBox
• Deployd
• LoopBack

Some build-your-own tools

• restSQL
• PostgREST