Google Docs and Drive have an offline mode that allows you to create and edit documents without an internet connection. Anything you do will sync with the online version when you're back online.

The Google Docs mobile app carries a nice feature that allows you to make files available offline, so if you lose connection to the internet, you can still access documents and edit them as before.

CSE-protected Word documents are to be supported in Google Docs (currently in beta) Some features may not be fully functioning to begin with Admins must apply for beta access Google has announced ...