[patrickg]

I travel a lot by train, which means a broken internet connection most of the time. Or when I stay in hotels or on a customer's site without wifi (3G doesn't always work well enough).

[donkeybanana]

I gave a personal instance of the Cloud 9 (https://c9.io/) IDE a go a year or so back. Using git locally and enabling git on the server gave me collaborative and offline options.

I think some form of VCS access to these services determines their ultimate usability.