Reference Material

GURPS 4th ed Hard Maths Blog
Various sci-fi and ultra-tech musings and materials

Gaming Ballistic Blog
Very hard-science, high-math rules analyses, and expansions

GURB – Generic Universal Roleplaying Blog
Ultra-tech musings and expansions

Pyramid 3-44
Fatigue and Action Point expansion
Cuts down on the 1-action every turn issues

Dungeon Fantasy 8
Treasure Tables

Reference Material

Neon Nights and Metal Men AnachronisticJam