Working offline and syncing with remote server

I realize this issue is a recurring one. But the technological landscape keeps on evolving rapidly. So, after fruitless searches, I would like to ask if there exist new WP plugins or applications that would enable traveling users (ie. salespeople) to work offline (for instance checking customer profiles, writing order proposals, etc.) and sync up with the remote WP site once their web connection is re-enabled? I am looking more specifically at iPads.

It appears that there are now iPad apps geared towards managing the backend in offline mode. Any comparable solutions for the front-end?

TIA for sharing any thoughts.