Quake II
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Todo: Elements relevant to Valve's engines (ex: skybox format, colored lighting, translucency, BSP format, etc.).
Quake II (1997) is the second installment of the Quake series, following Quake. Like it's predecessor, the Valve's 
GoldSrc engine also used some code from Quake II Engine, through it's usage is minimal and much lesser compared to 
Quake Engine.
Furthermore, 
Half-Life was originally planned to be released in November 1997 to compete with Quake II, but it's was later delayed to 1998 with Valve reworking every level of the game.
Bugs/Limitations
Important:Transparency and Translucency:
- Only translucency is supported in vanilla; alpha testing requires certain source ports (Notably not in Yamagi).
- Translucency is only supported on worldspawn textures and SP2 sprites, and cannot be used on brush entities or MD2 models in vanilla, due to the usage of the BSP tree for alpha sorting.
Compare to GoldSrc, which supports translucency on any brush entity except worldspawn (as well as models and sprites).
Some source ports (such as KMQuake2) support translucency on brush entities, but exhibit the same alpha sorting issues as GoldSrc.
Source ports
Thanks to the release of the Quake II source code, there have been many source ports that seek to supersede the vanilla engine. The following modern source ports are actively or semi-actively developed:
- Yamagi Quake II - Vanilla-friendly source port. Singleplayer-focused; multiplayer may be too insecure for netplay.
- Q2Pro - Multiplayer-focused source port, with added security fixes, optional anticheat, and many enhanced graphical features.
- Q2RTX (Quake II RTX) - Fork of Q2Pro with real-time raytracing.
- KMQuake II - Feature-focused source port, aimed at removing limits to increasing mapping potential.
- Quake II XP - Graphics-focused source port, porting the graphics pipeline to modern GLSL. Aims to remaster the visuals without sacrificing the original "style" of the game.