Second board has all early Combine machines and humanoid enemies and vehicles.
For machines first row: Rollermine?, Combot, Manhack, Synthcrab, Gunship, Strider. Under Manchack is, most likely, Mortar Synth.
Humans row: Gasmask Citizen, Camo Soldier or a regular Combine Soldier, Metrocop, Stalker, Cremator, Elite Synth Soldier (with a spear), Alien Assassin (Breeder), Alien Soldier (worm), Advisor.