An Hour of Wolves and Shattered Shields has a selection of high resolution shield designs for Vikings. Either print them out on decal paper, or on regular paper and glue them to the model.
Dark Ages
Villehardouin Free Board Game
Villehardouin is a free map-and-counter board game from the great designers at Perfect Captain. It’s a game about the Byzantine Reconquest of the Morea in southern Greece in the year 1263 AD.
Viking Painting Guide
Crusader Miniatures has a painting guide for Vikings.
Battle of Legnano Board Game
The Battle of Legnano is a complete print-and-play wargame for the medieval battle of Legano in 1176. In that battle the forces of the Holy Roman Empire, led by emperor Frederick Barbarossa met the Lombard League.
Battle of Red Gate Crusades Scenario
Battle of Red Gate is a Crusades scenario featuring the Franks and Damascenes in 1106.