Source of Mayhem by Incognita /code/demosrc/demos/mayhmsrc.zip	17 Jan 1999 (catalog date) 276,437 bytes
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No documentation, but it contains some modern effects like metaballs and realtime raytracing.

Hooray by Neon of Spetsnaz /code/demosrc/intros/hooray.zip	19 Jan 1998 (catalog date) 31,077 bytes
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Hooray 4-k intro (raytracing). Good code style for assembler, well commented functions, poorly commented math.

Free direction tunnel tutorial by Blackaxe of Kolor /code/effects/tunnel/fdtunnel.zip	30 Jun 1998 (catalog date) 4,008 bytes
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A good tutorial about coding free direction tunnels using the realtime raytracing method. Text

Ravetracing by System X32 /demos/1997/s/sx32-rtr.zip	07 Dec 1997 (catalog date) 419,030 bytes
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Released at event DST97 in the demo division and ranked 08