The Apstrata Javascript SDK is a sophisticated apstrata client implementation using the dojo toolkit, it can also be used in conjunction with other frameworks such as jQuery. The SDK can be used to implement mobile applications too using frameworks such as dojo mobile or jQuery mobile.
You can download the apstrata Javascript SDK from http://code.google.com/p/apstrata/source/browse/#svn%2Ftrunk%2FApstrataSDK or from http://code.google.com/p/apstrata/downloads/list