SLADE 3 is a cross-platform wxWidgets-powered utility for modifying WAD and PK3 files. It is developed by sirjuddington.
SLADE 3 is a modern utility, designed for modifying Doom data files. It has a multitude of features making it the most powerful Doom data editor to date. It supports Zandronum's custom data, and supports advanced features. It has full support for all ZDoom and Zandronum supported palettes, image files, music files, and so on. It provides an easy interface for manipulating data, such as converting graphics, sounds, modifying texture offsets, editing code, and so on. It also includes a work-in-progress map editor.