Online wallets, even the ones managed by professionals, have a history of getting hacked. With that said you can look into coin punk and brain control. Both have open source versions
http://coinpunk.org/
braincontrol.me
Topic: Online Wallet Options (Read 1359 times)
I've done some searching on Google and have yet to find a good answer - what are the available options for setting up an online wallet? Basic functionality would be simply user accounts with associated bitcoin wallets (yes, I know there are online wallets already available; I'm looking at starting a project that would require me to have my own online wallet server). Hopefully the question is as straight forward as it seems 
Any information you could provide to get me in the right direction would be greatly appreciated.
Any information you could provide to get me in the right direction would be greatly appreciated.
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