I ported Yamagi Quake II to the Switch.
Github repo: /fgsfdsfgs/nxquake2
Latest version: 0.2.0 (Sep 16, 2018)

Warning: Spoilers inside!

Some of the features of the port:

• hardware accelerated rendering using YQ2's GL3 renderer;
• sound and OGG music support;
• multiplayer (not really tested);
  
• analog controls and shit.

To install it, just unzip nxquake2_020.zip to the root of your SD card, then copy the baseq2 folder from your Quake II installation to /switch/nxquake2/. If you want to use the config file included with the release, don't forget to select "no" when asked if you want to overwrite it. You can then run the game using the Homebrew Launcher.
You can use the Quake II demo for this, read the README on Github for details.

Some notes:

• if it crashes and exits back to HBL/Horizon silently, check /switch/nxquake2/crash.log to find out what caused it;
• music works the same way as it does in regular Yamagi Quake II: put the OGG music tracks (named 02.ogg - 11.ogg) into /switch/nxquake2/baseq2/music/;
  
• mods or mission packs are not supported yet;
• analog controls are a little bit wonky, especially when FPS dips;
  
• better exit the game using the Quit option in the menu;
• there's no real way to connect anywhere except editing the address book manually on PC, or maybe LAN discovery, which I haven't tested;
  
• you might notice that this is an almost exact copy of the NXQuake thread's OP;
• if you want pixelated textures, change gl_texturemode in config.cfg to GL_NEAREST_MIPMAP_NEAREST;
• right analog sensitivity is controlled by the console variables joy_pitchsensitivity (up/down) and joy_yawsensitivity (left/right), you can edit their values in config.cfg;
• reboot into orange screen means a GPU crash happened, report this;
  
• port is pretty barebones, so if you have any suggestions or bug reports, please post them here or in the Github issues.

Credits:

• Yamagi for Yamagi Quake II;
• fincs, Armada651, Subv and probably others for their work on the OpenGL/mesa/libdrm stuff;
  
• some nice people in the ReiSwitched Discord for help and testing;
  
• id Software for Quake II itself.