You could check out Pythonista, Codea, Javascript Anywhere, TechBASIC, DraftCode (for PHP) and Continuous (C# and F#). Those are all coding apps so you can program directly on the device. Several of them also enable packaging the programs you create for distribution on the App Store. Several of them also have built-in GUI authoring tools although I generally prefer to build my GUIs in code.
Working Copy is an excellent GIT client and works well with many of the above and there are plenty of coding editors. There are also a plethora of non-programming creativity apps, many of which are useful for coding projects.
Working Copy is an excellent GIT client and works well with many of the above and there are plenty of coding editors. There are also a plethora of non-programming creativity apps, many of which are useful for coding projects.