To get started with level editing, you need to choose an editor that is right for you. If you want to jump right in to mapping, here are a few of the most popular ones (see editors for a comprehensive list): * Doom Builder 2: This free editor comes with various features and a nice interface. * DeePsea: This editor contains a rich selection of features including sprite and texture editing built in. DeePsea is commercial software; there is a free trial version, but you must register to be able to save large levels. * WadAuthor: This has a different interface to other editors.