Departure Mono
Not sure I'd ever really have a need for this, but just in case... a fun-looking pixel-based monospace font.
Input: Fonts for Code
Tidy font to remember any time I get the itch to change my editor or terminal font.
Lem
A programmer's editor written in Common Lisp, written for Common Lisp, which aims to be a good Common Lisp IDE; but which also works as an IDE for other languages too.
Think Emacs in Common Lisp.