Here is a listing and small pictures of all the mechs available in the world of Legacy: 4632. They are divided by Faction.

Allied Defense Force:

The Apollo, Apollo Commander, Nemesis, Artemis, Poseidon and Zeus

The Ascended:

The Ares, Kratos, Erebus, Kraken, Cratus and Cratus Commander

Suits Available to other groups:

The Mercenary Model, Gladiator Model, Recon Model, Construction Model, Security Model and Defender Model

Unique Suits:

The Phoenix, Samurai, Shatterstar, Knight, Arachnos and Downtown

The Tank, Firefly, Shigra, Hammer, Grilok and Vanguard