It's the Ape Apps Launcher for GZDoom! Originally modeled after the classic Doom 95 launcher, but since modernized. Created by Brandon Stecklein at Ape Apps.
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Support Forum
https://www.ape-apps.com
Main Configuration
Executable Location
IWAD Directories
Custom File Directories
Multiplayer Defaults
Username
Server Name
Miscellaneous
Desktop Entry
Create a linux application launcher icon for aaZDoom Launcher