You can use any text editor or IDE for working on Ruby on Rails projects. That said, many text editors and IDEs have plugins for adding extra functionality to make it easier to develop websites with Rails.
If you add editors, please add them in alphabetical order.
by Bare Bones Software - license costs $125
E is a commercial editor for Windows that can use TextMate bundles. It costs $34.95 from e-texteditor.com.
Emacs is a highly extensible, full-featured text editor. Emacs has been in development since the 1970's and continues today.
by Macromates - license costs €39 ($57)
from vim.org, and, for Mac, MacVim
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