Adam Bilbrough (Gibbon)

Adam Bilbrough, commonly known as Gibbon within the Doom community and atsb elsewhere, is a British programmer. Gibbon's work focuses around maintaining 64-bit derivatives of older source ports such as WinMBF and Boom and doing so for several architectures.

Additionally, he is known for compiling several builds of ports that do not have any compiled binaries, again to several platforms such as, , based Apple Mac models (such as the ), and  based Apple Mac models.

Contributions
In regards to Doom history, Bilbrough has created the following source ports:

Source ports

 * Pooch
 * ReBoom
 * ReBoom Experimental
 * RZDoom
 * Sprinkled Doom
 * SRCD-Doom

Executable hacks
Outside of source ports, Bilbrough also worked on the following executable hacks:
 * Doom128
 * Heretic128
 * Hexen128

Source port builds
In addition to his own custom ports, Bilbrough hosts a service called Source port builds where several source ports, left in a unmaintained or otherwise compile-only state, are compiled into a playable binary for various platforms and maintained. No changes are made except which are required (upstream devs will be notified) and are compiled for Windows (64-bit), for, for and , both for  and. The following ports have been compiled:
 * Aengine (GZDoom based)
 * Carob
 * Chocolate Doom Plus (AxDoomer's version)
 * Chex3gzd
 * Clown Doom
 * Crispy Doom (Mac M1 build)
 * Crispy Heretic
 * Crispy Hexen
 * Crispy Strife
 * Doom05RE
 * Doom Retro (Mac Intel & Mac M1 builds)
 * DSDA-Doom (Mac Intel & Mac MI builds)
 * EZ_Boom
 * GLOOME
 * Headless Doom
 * Micro Doom
 * Milky Doom
 * Neopolitan Doom
 * Nugget Doom (Linux build)
 * Nugget Doom LR
 * PrBoom+um (Mac Intel & Mac M1 builds)
 * RanDOOM
 * SDL Doom
 * SDoomPort
 * Thanatos
 * Toffee Doom
 * WinMBF (Lua & AngelScript versions by Alex Mayfield (AlexMax))
 * Woof! (Mac Intel & Mac M1 builds)
 * ZDoom (64 bit build of 2.9 pre, December 2016. Mac Intel, Windows, Linux and FreeBSD builds)
 * Zip Doom
 * ZMemory (Not a port, but a tool for dynamic memory allocation)

Other developments
Outside of Doom, Bilbrough is a maintainer of several packages for the operating system and the. These include the document organizing program OrgaDoc and the program Mcron, a fork of the software utility.