The Dark Mod features its own customized editor, DarkRadiant. It is an open source tool available for Windows and Linux, aimed at making the mission creation process as easy as possible.
You can download DarkRadiant from its project website http://darkradiant.sourceforge.net/.
The Dark Mod's basic installation already includes a lot of assets and prefabs to build missions with. However there are a number of extras available below to make a mission author's life a lot easier. If you have prefabs or other assets you would like to share, please post in our I Want to Help forums.
- Mapper's Startpack v3 (5 MB) -- a complete set of components that can be used to both start and finish off your FM.
We have an extensive wiki site with tons of information for FM authors. You can also follow the "Forums" link above to the TDM forums to ask for help or advice.