Line units:
Chaos Space Marines - very similar to their counterparts. Armed with bolters and frag grenades.

Noise Marines (lascannon devastators) - powerful against infantry and units in cover. Very loud.

Bloodletters - swarm of melee units armed with hellswords.

Raptors (assault marines) - high speed melee units with a jump attack and frag grenades.

Plague Marines - resilient ranged unit with an aura that sickens nearby enemies.

Rhino - transport tank capable of dropping smoke grenades. regenerates health.

Chaos Vindicator - tank armed with a powerful demolisher cannon.

Helbrute - Chaos corrupted dreadnought. Strong melee attack and a multi-melta.

Elite units:
Chaos Lord (chaplain) - can teleport, and has an aura that increases weapon damage for nearby allies.

Chaos Sorcerer (librarian) - lightning attack, an aura that weakens nearby enemies, and a hex that stuns and removes shields.

Obliterators (terminators) - devastating fleshmetal guns effective against infantry.

Bloodthirster - huge demon with claws and fireballs. Currently has no autoattack.

Traitor Knight Castigator (paladin) - large unit with bolt cannon and massive chainsword.