Environment

[Dolby]

You can find a few popular editors listed here: http://wiki.riftui.com/Author_resources#Text_Editors other authors feel free to add your favorite if its not on that list.

I use Editplus3 on win7, Smultron on mac, Nano on *nix

[Kreiri]

I use PSPad.

[Hegarol]

Texteditor: Notepad++(Windows), TextWrangler (Mac)

SVN: Tortoise (Windows), Versions (Mac)

[SAI Peregrinus]

EMACS with lua-mode. Git for (local) versioning. Why use anything else?

[Nut]

Notepad++ is unbeatable in many areas. You can customize colors, texts, layouts, etc to whatever you want. It's FREE, and works like a paid editor.

[TMc51]

I'm another Notepad++ user. It has most of the most useful features that a lot of the commercial editors have without the bloat.