Highlighting Text Editor

Question

I need a text editor (for programming pourposes) that supports the following features:

1. Multi-Language syntax-highlighting
2. Mult-plataform (UNIX/Windows)
3. Graphical Interface
4. Square Block of Text selection

On windows, I use ConTEXT, but, it is not Mult-plataform (issue 2). On Linux I use Gedit, but, fails on issue 4.

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Is there any editor that suits all these needs?

EDIT:

Issue 4 is, select a square (or rectangle if you wish) like this:

aaaaaaaa|aaaa|aaxxxxxa 
bbbbbbbb|bbbb|bbbxxxxx
cccccccc|cccc|cccxxxxx 

Answer 1

Multi platform? Emacs or gVim.