A traditional UNIX system text editor, should be on any UNIX system. It requires learning a few key combinations, but is very powerful, and it is also quite small. vi is well known for its minimal use of resources.
vim | |
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vim - vi improved. A newer version of the vulnerable vi editor. Many systems use vim rather than vi. |
More than just a text editor. This text editor has a steep learning curve but is also very powerful, it is both advanced and quite large. emacs can do anything, surf the internet, chat, play games and many other tasks.
There are too many different text editors to list here. Have a look on the internet, either search for them using any search engine or you will find many of them at Sourceforge or Freshmeat.