I haven't played M.A.X (1) in a long time, and forgot a few clans, which other ones are there than:

Axis Inc.
Musashi
Crimson Path
Chosen One
Von Griffin

The Chosen
Better Air Units:
AWAC: +2 scan
Fighter: +1 range, 7 turns
Air Transport: +4 speed
Ground Attack Plane: +4 attack, 9 turns
Air Units Plant: 15 turns

Crimson Path
Better Sea Units:
Missile Cruiser: +1 range, 11 turns
Escort: +2 speed, +1 scan
Corvette: +2 speed, +1 armor
Gunboat: +2 armor, +4 hits, +1 range
Submarine: +4 attack, +2 speed, 5 turns
Sea Transport: +2 speed
Cargo Ship: +2 speed
Shipyard: 15 turns

Von Griffin
Improved Espionage:
Scanner: +4 scan, +1 speed
Scout: +2 scan. +2 speed, +2 attack
Submarine: +2 scan, +2 speed, +4 attack
Infiltrator: +1 scan, +1 speed, +2 disable, 8 turns
Radar: +6 scan
AWAC: +4 scan, +2 speed
Personnel Carrier: +1 armor, +2 hits, +2 speed

Ayer's Hand
Better Missile Units:
Rocket Launcher: +1 range, +2 attack, 6 turns
Missile Crawler: +1 range, +2 attack, 10 turns
Missile Launcher: +1 range, +2 attack, 10 turns
Missile Cruiser: +1 range, +2 attack, 10 turns

Musashi
Better Armored Vehicles:
Gun Turret: +4 attack, +2 armor, +4 hits
Tank: +4 attack. +2 armor, +4 hits, +1 speed
Gunboat: +4 attack, +2 armor, +8 hits, +1 range
Personnel Carrier: +2 armor, +4 hits, +1 speed

Sacred Eights
Better Fast Units:
Escort: +1 range, +2 speed
Mobile Anti Aircraft: +1 range, +2 speed
Ground Attack Plane: +2 attack, +2 speed
Assault Gun: +4 attack, +2 speed, +1 range, 6 turns
Scout: +2 attack, +2 speed
Corvette: +2 attack, +2 speed

7 Knights
Better Defense:
Radar: +2 scan
Sea Mines: +8 attack
Missile Launcher: +1 range, +2 attack, 11 turns
Gun Turret: +4 attack, +2 armor, +4 hits
Land Mine: +8 attack
Artillery: +1 range, +2 attack
Anti Aircraft: +1 range, +2 attack

Axis Inc.
Extra constructors and engineers (depends on budget)
Heavy Vehicle Plant: 16 turns
Light Vehicle Plant: 8 turns