Windows: Open GL | WinQuake (software renderer)
Windows: Direct3D

No new Mac build for now.

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Primary Features
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Mirror support. Worldspawn key "mirroralpha". Textures must be prefixed with "mirror_". Can specify specific texture with r_texprefix_mirror. See the Quake startmap, go to easy hall.

No limit to # of mirrors, provided they cannot see each other (3 in a row on same plane = ok!).

Find command. Type "find sky" or "find speed" and you'll see what I mean. Similar to the DarkPlaces apropros command.

Nehahra Support is complete and fully polished to the absolute maximum. It's like a dream.

Built-In Quake Injector Install now auto-completes 500+ of the best releases. Press CTRL+space to autocomplete or TAB.

Like type "install travail" or "install rapture" in the console, it downloads and installs it. Then type "game travail" and do Single Player->New Game.

"hdfolder" command to specify an optional content replacement folder. Change it in the console.

Zoom key. Bind x +zoom_key -- one size fits all script for sniping scrags across a bridge.

International keyboard support. Needs tested for verification (in_keymap 0 turns it off).

Convenience
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Automatic HUD sizing. See menu. No more using scr_menuscale unless you want to.

Stretching For WinQuake version -- stretching. Play at 320x240 full-screen resolution even if video mode not available.


Co-Op, LAN and Networking Features
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Co-Op ghosting for 5 seconds -- walk through other players/no telefrag for first 5 seconds. No coop spawns? Who cares!

Marcher Fortress can be be played co-operative, engine overrides a Marcher QuakeC oversight.

IPv6 support (from QSS)

connect lan, type that in console and no need to figure out LAN server IP address for playing co-op.

Server browser + single port server. (from Quakespasm Spiked)
"reconnect" -- reconnects to last server connected to.

Multiplayer save game capability. Save a co-op game.


Flexibility
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Different gun positions available including "side-mounted" (r_viewmodel_offset).

Multiple HUD-support (i.e. Quakeworld HUD, .. see menu)

Texture gamma option. Do vid_hardwaregamma 0, and you can adjust gamma via typing "txgamma 0.7" in the console. No cpu/gpu cost.


Server Connectivity
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Disconnecting from a server will discard any aliases the server provided.
Disconnecting form a server will discard any key binds the server sent.
Complete ProQuake support including depot map/model/sound download.


Polishing
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Final Malice bug fixed (for NightFright).
Original Quake centerprinting option. scr_originalquake2d
Ability to disable multisample attempt via cmdline -nomultisample. Same with stencil -nostencil. May make older computers be able to use OpenGL version.
Direct3D version can now do transparent weapon with invisibility ring. So can WinQuake build. (from qbism super 8)
Software renderer supports stretch modes.
Ability to have jerk stairs like original Quake. See menu.
sv_gameplayfix_setmodelrealbox for QRally and other ancient mods.

Source code

[Partial list, some other minor features may be in the thread. Source code link will work later in the day.]