(Text is from ReadME.md):

Raze is a fork of Build engine games backed by GZDoom tech and combines Duke Nukem 3D, Blood, Redneck Rampage, Shadow Warrior and Exhumed/Powerslave in a single package. It is also capable of playing Nam and WW2 GI.

The game modules are based on the following sources:

Duke Nukem: JFDuke, EDuke 2.0, World Tour extensions from DukeGDX and some minor fixes from EDuke32.
Redneck Rampage: Nuke.YKT's reconstructed source available in the Rednukem Git repo.
Blood: NBlood.
Shadow Warrior: SWP and VoidSW.
Exhumed/Powerslave: PCExhumed, with some enhancements inspired by PowerslaveGDX.

ZDoom, GZDoom Copyright (c) 1998-2020 ZDoom + GZDoom teams, and contributors

Doom Source (c) 1997 id Software, Raven Software, and contributors

EDuke32 and VoidSW Source (c) 2005-2020 EDuke32 teams, and contributors

NBlood source (c) 2019-2020 Nuke.YKT

PCExhumed source (c) 2019-2020 sirlemonhead, Nuke.YKT

BuildGDX (c) 2020

Duke Nukem 3D Source (c) 1996-2003 3D Realms

Shadow Warrior Source (c) 1997-2005 3D Realms

"Build Engine & Tools" Copyright (c) 1993-1997 Ken Silverman Ken Silverman's official web site: http://www.advsys.net/ken See the included license file "BUILDLIC.TXT" for license info.

Please see license files for individual contributor licenses

Special thanks to Coraline of the 3DGE team for allowing us to use her README.md as a template for this one.
Non-Build code is licensed under the GPL v2
https://www.gnu.org/licenses/old-licenses/gpl-2.0.html