STEEL
- An Integrated development environment for REBOL.
- http://www.rebol.it/steel/

reboLDAP
- A project intended to develop REBOL tools for the Lightweight Directory Access Protocol.
- http://vvn.net/reboldap/

VIM Syntax Files
- Syntax highlighting in the VIM editor for REBOL source.
- http://www.eandem.co.uk/mrw/vim/syntax/

REBOL mode for Emacs
- Correct indentation and styling for REBOL coding in Emacs
- http://www.rebol.com/tools/rebol.el