- Grey Company Trebuchet Page
 - Offers diagrams and descriptions of leverage artillery, referred to variously as traction trebuchets, petrarias, war wolves, coulliards, and bricoles. - Slinging.org
- News and information on the ancient projectile weapon, the sling.
- All about Catapults
- Information on trebuchets and catapults, includes discussions, models, and message board.
- NOVA Online: Medieval Siege
- Documents NOVA's successful attempt to build and shoot a giant trebuchet, the most destructive war machine that ever laid siege to a medieval castle.
- i Catapults
- Includes plans for how to build a catapult, history, and a quiz.
- Trebuchet, The
- At the NF/Observatory.
- Trebuchet Challenge
- Custom build a virtual trebuchet and test its distance, accuracy, and power in a series of challenges.
- Warwick Trebuchet
- See time-lapse footage of the Warwick trebuchet being built and learn why siege machines dominated warfare for 200 years.
- Cotton Ball Catapult
- Plans for building a catapult from items found at home.
- Anthony's Trebuchet Page
- Images of the construction and firing of his trebuchet.
- Office Supplies Trebuchet
- Simple step-by-step instructions on building a trebuchet out of basic office supplies.
- Siege Artillery
- Dedicated to ancient siege engines, offering images, diagrams, and models.
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