What code editor do you use?

[techno_race]

..open-source? Automatic code cleanup? Uh...uh...(checks menus) session saving? Unicode support? Line numbering? Current line highlighting? Line marking? Macros?? Uh...spell-checking (WTF!?)?

[Twey]

Yes: it's one of the classic examples of open-source apps, developed by rms himself at MIT in the '70s.
Yes: select the region you want and do M-x untabify (to replace tabs with appropriate spaces) M-x indent-region (to fix the formatting).
Yes: they're known as desktops. There's also automatic session-saving so you can recover all you were doing if the system dies.
Yes: well, there'd have to be for all the IMEs and input modes I mentioned, wouldn't there? There's support for just about every encoding under the Sun, including several Unicode-aware ones, and automatic transcoding, so you can work on a file in a completely different mode to your system and input modes without blinking.
Yes: duh.
Yes: there's a minor mode dedicated to it, called hl-line.
Yes: I'm not sure if what we mean by this is the same thing, but it's possible to set a bookmark on a line to come back to it later (and emacs does smart things with the text around it, so if the line moves or changes, your bookmark stays with it).
Yes: considering that emacs actually started out as a collection of Editor MACroS, it has very good support indeed. Macros are written in elisp, for power, but you can also auto-generate them from a sequence of actions in the editor (think Microsoft Office macros, but with a less crappy language).
Yes: covered it in the last post.