What are some alternatives?
When comparing Siberian CMS and Working Copy, you can also consider the following products
Fuse - Fuse is a UX tool suite for mobile app designers and developers.
CodeHub - CodeHub is the most complete, unofficial, client for GitHub on the iOS platform.
Dropsource - Mobile development platform for building native iOS & Android apps
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
GoodBarber - GoodBarber is a mobile app creation platform.
Git2Go - The Git client for iPhone and iPad you always wanted