Projectile Motion Resources - Physics by DiscoveryPhysics by Discovery

From the Physics Classroom:

Tutorial on Projectiles (For help understanding projectile motion; look for Lesson 2)
Concept Builders (Check conceptual understanding; choose projectile motion topics)
MindsOnPhysics Missions (Check conceptual understanding; choose Missions VP7 to VP10)
Horizontally-Launched Projectile s (Includes Simulator and Concept Checker)
Angled-Launch Projectiles (Includes Simulator and Concept Checker)
Projectile-Sim by KirbyX (Simulation only: Can adjust valley floor, cliff height, initial speed, launch angle, g)
Hit the Target (Test yourself on horizontal-launch projectile problems)

Note: Be aware that the Physics Classroom defines a projectile is an object moving under the influence of the force of gravity alone. According to this definition, a dropped object is a projectile, since their definition does not require the object to be moving in two dimensions.