Ok here is some units, just to get started. Please correct me.

Norway:
- Bondi
- Karl
- Geirrmen
- Landsmen
- Berserkers
- Huskarl
- Archers
- Raiders
- Hird
- Jomsviking
- Birkebeiner (english..?)

Saxons:
- Spearmen
- Armoured Spearmen
- Warband
- Light Cavalry
- Skirmishers

Welsh:
- Longbowmen
- Cavalry
- Swordsmen
- Skirmishers

France:
- Spearmen (light, armoured)
- Light, heavy cavalry
- Skirmishers

Magyar
- Light archers
- Horsemen
- Lancers
- Swordmen
- Szekely
- Heavy Infantry

...