For those looking at alternative BaaS services, we hope you'll take the time to evaluate StackMob. We've been working hard the last 24 hours to put together an easy path to migrate your apps from Parse to StackMob.
I always thought that Firebase and Backlift (Both are YC backed as well by the way) are doing something very similar, never had the chance to analyze the differences seriously though.
Edit: a "Firebase vs Parse" question on Quora [0] (it's the first answer, no login required) made me realize that Parse is much more "mobile first" (tm), with a "full service" for mobile apps, whereas Firebase is taking "just" a subset (a very big subset) of data persistence, authentication and data security (e.g. server-less apps, which can be used in also in Mobile apps, but things like push notifications etc are more "role your own")
[0] http://www.quora.com/Firebase/How-does-Firebase-differ-from-...
I think http://helios.io/ belongs on this list... I only found out about it yesterday, but I will definitely be checking it out
Thanks for such an innovative news. For DataKit: https://github.com/eaigner/DataKit/
Appcelerator Cloud http://www.appcelerator.com/platform/appcelerator-cloudservi...
App42 http://api.shephertz.com/
Kumulos http://www.kumulos.com/
Kinvey http://www.kinvey.com/
Apstrata http://www.apstrata.com/
Buddy http://buddy.com/
Stackmob https://www.stackmob.com/
Proxomo http://www.proxomo.com/
Iknode http://iknode.com/
Kii http://www.kii.com/en/technology
CloudMine https://cloudmine.me/
Applicasa http://www.applicasa.com/
MobDB https://www.mobdb.net/
Windows Azure Mobile http://www.windowsazure.com/en-us/develop/mobile/
FeedHenry http://www.feedhenry.com/
-- My favorite ones are in the order of preference following :
Appcelerator (currently using it )
App42 ( tried it )
Stackmob (tried it )
Kumulos