If you are okay with command line interface and vim. I recommend Termux. It's a terminal emulator that runs a version of Linux. It's not exactly complete but it has everything I needed; SSH, Git and Vim. It even has the exact vim config and plugins as in my server and macbook. I always have trouble doing work in public transport though and would rather read.
Will check it out. Thanks for the suggestion!
Termux is awesome, I used that app a lot while I didn't have a proper desktop. It helped me in many ways, I was able to learn and code in many programming languages, I could connect to SSH servers, hack configuration files, test out open source programs and much more. This app is a lifesaver!
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