SLADE

SLADE is an open-source map editor created and maintained by SlayeR. It is currently at version 1.01:

Features

 * Uses SDL/OpenGL for fast drawing and cross-platform compatibility
 * Some general 'Eye-candy' features
 * Colour configurations
 * Skins
 * 3d Editing mode (Including slopes)
 * Uses GTK for the user interface

The following features are planned for future versions:


 * Improved editing features
 * Support ZDoom's DECORATE lump