I have tried using Borderless Gaming on a few source ports and so far these are the ones that have hackable borderless fullscreen.
- PrBoom+ — Works right of the bat with a simple "Add to Favorites" click and the game can be played with borderless fullscreen.
- ZDoom (plus GZDoom and Zandronum) — It's possible with Borderless Gaming but it requires Auto-Maximize enabled for the UI and HUD to fit properly on my 16:9 display from my experience. It also takes a couple of seconds for the UI and HUD to be re-adjusted when using Borderless Gaming.