Off the top of my head...
ZBrush X-Y+Z+ (not 100% sure)
CryEngine 3 X+Y-Z+
Blender 2.4x+ X-Y-Z+
Blender 2.57+ X+Y+Z+ (now uses mikktspace
xNormal X+Y+Z+ (also uses mikktspace
Nvidia Filter X+Y-Z+
Feel free to correct them, if i got any wrong
While the axis that different programs use are insignificant when compared to the other complications, i still think it would be a good idea to get these on the Wiki, as when i was first starting out it used to drive me crazy trying to find them all out.