Vim is a command line text editor, created after the original Vi software in 1991. You can find it -or some variant of it- in almost any modern Unix box around. It's not the kind of software you feel comfortable using since the first day: instead you need to read the manual and practice a lot. But this comes with a reward, you'll be editing your text files at the speed of light. Features like repetitions, macro recording, counters... makes the most tedious tasks a little more enjoyable. It's also a great tool for programming: not an IDE, but its syntax highlighting and programming language add-ons make it ideal for C/C++ coding. And it's free! In both senses.

I use VIM and gVIM most of the time of work time to develop code and it's really awesome. First is hard to start, but when you use it during a few weeks you get totally addicted to their functions and posibilities. Without use the mouse, you can do whatever you want, copy and paste, highlight, delete parts, ident the code etc, and all of that, hundred times faster than using the mouse.

I use the VIM for more than 10 years, and is a text editor with incredible potential, when you know how to use it, it has incredible functionality. Being able to use it without an X11 environment allows me to edit code wherever I can connect to SSH, in an agile and simple way. Without a doubt, the best thing to do is the command inputs that allow you to manipulate text in different files, always without the use of mouse.