I mainly use it to run vi for small notes (i don't think it has full vim by default). I'm not really a vi fan (i used vim at the past, but today vi in termux is the only vi i use) but i just couldn't find any note taking application that i liked.

I also run mc sometimes.

Btw i use it with "Hacker's Keyboard", although the only reason i use that is because it has an esc key :-P.