I will try to make a list of Nomads exclusive stuff/units (if something is not in the list, please reply this post):
ACU Orbital Refoircement Upgrade: It spawns T1PD and T1AA on any area on the map, is something that still need some work and balancing.
Radar Boosts: There is a icon in the orders panel when selecting a radar/sonar to boost the radar, it charges up the radar for a few seconds , after ifs done, the radar gets 50% more range for 10 seconds.
Stealth Shields: Nomads doesn't have T2 Static Stealth Fields, but T2 and T3 Shields can be upgraded to Stealth Shields, the stealth radius is the same of the shield radius.
T3 Mobile Missile Defence: It can be built from T3 Land Factory and T3 Naval Factory.
T3 Mobile AA.
Hover units: All hover units walks slower in the water (average is like 40%, including experimentals)
Hover experimentals: Nomads has two hovers experimentals.
To be continued...