Polymer
Polymer is a modern OpenGL renderer written by Plagman utilizing modern shaders and demanding a lot of CPU/GPU power for high performance. Polymer supports modern diffuse/normal/parallax/specular/height mapping and dynamic lighting.
Polymer uses a modern algorithmic approach to rendering allowing it to implement spot lights and point lights, plus the relevant texture effects to make best use of them. This is in contrast with Polymost which imitates the software renderer.
Screenshots can be found at the EDuke32 homepage.
Polymer's source code can be found under the BUILD license here: https://voidpoint.io/terminx/eduke32/-/blob/master/source/build/
See rendmode and Polymer Deficiencies.