Hnefatafl: History and rules of the game and variants, like Tawlbyund and Alea Evangelii. Also the history and rules of related games like Ludus Latrunculorum and Seega.
Hnefatafl - An Experimental Reconstruction: Includes rules and figures depicting several variants. Written as a paper for an archaeology course.
Hnefatafl - the Strategic Board Game of the Vikings: An overview of rules and variations of the game by Sten Helmfrid.
Nefatavl: Contains rules and game information.
Taefl: The Saxons & Vikings: Offers rules and history with free downloadable computer version.
Tafl: An Obsession: Contains a brief history of the game, an outline of the rules, tips on strategy, and a Java applet to play the game.
The Online Guide to Traditional Games: Contains history and information on the game family.