WadAuthor
From ZDoom Wiki
WadAuthor is a Doom level editor with support for ZDoom editing via custom configuration files. It was developed by Williston Consulting and is a shareware application. The user is free to try WadAuthor for fifteen days, after which they should pay a registration fee if they wish to continue (after fifteen days the software stops functioning). Apart from occasional flashes, WadAuthor's development has been stalled for some years.
