PDDL Mode ← dead link
PDDL-mode is a major Emacs mode for editing PDDL 2.2 files. It provides syntax highlighting with automatic indentation, templates, auto-completion, and a “Declaration”(imenu) menu which lists all the actions and the problems in the current file.
This release should work on any recent version of Emacs or Xemacs. If it doesn’t: complain.
Follow the above link to download it.