Since you already know about the SDK we are providing to built hybrid offline apps(Kapsel), and you are looking for other options, you can try implementing offline through open source technologies.
You can convert your SAPUI5 web app to a hybrid app with Cordova framework and use a database/storage plugin in cordova to store your data offline. But, the challenge here is that you have to manage the offline process your own through coding which is tough - Delta management, error conflict management(what happens when two people try to modify the same data), encryption of offline store, keeping offline store updated, and moreover making sure the app you built works even after mobile OS upgrade(does the open source plugin continue supporting new OS versions?).
I am sure that you will find other open source ways too to get a database for your app to make it work offline - but, with SAP's SDK a developer's life is so easy.
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