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Castle and Siege Terminology
Fairly lengthy page of terms concerning parts of the castle and items used in besieging it, suitable for printing or downloading, compiled by T. J. Ray.

Castle Siegecraft and Defence
Helpful overview of castle warfare at the Castles of Wales site has some nice photos and diagrams.

The Grey Company Trebuchet Page
Pages on counterweight trebuchets, traction trebuchets, historical reconstructions and more, with lots of pics, provided by the Grey Company reenactment group.

Ingenium
Entertaining pages by Kevin A. Geiselman include a basic explanation of trebuchet physics, stories of his own experiences building trebuchets, construction hints, and printable plans.

Medieval Mechanical Artillery
Lots of pictures of working trebuchets and explanatory info, by Patrik Djurfeldt.

Non-Gunpowder Artillery
An informative introduction to medieval war machines is followed by concise illustrated overviews of specific engines such as trebuchets and mangonels. Nicely done at the Oriflamme Society. Hint: Let the page load completely before using the navigational menu.

NOVA Online: Medieval Siege
The companion website to the NOVA program has interactive segments for destroying a castle and "medieval arms race" as well as photos on the trebuchet constructed for the NOVA experiment.

Siege Engines
Four different types of engines (Ballista, Mangonel, Perrier and Trebuchet), with photos and diagrams, at Codesmiths. Hint: use your back button to return to the main menu instead of clicking on to the next section.

Trebuchet at Middelaldercentret
Photographs and information about the Trebuchet and mangonel at the Centre for Historical Technology, Denmark, is provided by the Grey Company in Australia.

Weaponry: The Trebuchet
A look at the weapon and its evolution, by Scott Farrell at MHQ, online at TheHistoryNet.