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I use https://panic.com/prompt/ on my iPhone & iPad to SSH into a machine and then just use VIM from there.

I use Prompt + vim as well. I don't always travel with my personal laptop and it's nice for prototyping or quick fixes.

Check these out...

ProCoding: http://procoding.audiocommander.de/

Textastic[1] and gitmongo[2] are my indispensable duo when it comes to code editing, searching and git interactions on my iphone/ipad.

[1]: http://www.textasticapp.com/

[2]: https://itunes.apple.com/us/app/gitmongo/id593450102?mt=8

I'm a big fan of Pythonista: http://omz-software.com/pythonista/

There is Raskell which lets you write and run Haskell on an iPad, using a modified version of the educational Hugs compiler (so it's more for recreative programming than serious projects): http://slidetocode.com/raskell/