Working Copy - The powerful Git client for iOS
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Source iOS - The best git client and code editor for iOS.
TreeSize - TreeSize tells you where precious disk space has gone to.
CodeHub - CodeHub is the most complete, unofficial, client for GitHub on the iOS platform.
SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.