Tools for making interesting presentations and animations

• PowToon: http://www.powtoon.com/ (Free account required, online)
• Garry's Mod: www.garrysmod.com (Paid, Windows/Mac, $9.99)
  
• Wideo: http://wideo.co/ (Free account required, online)
• Moovly: http://www.moovly.com/ (Free account required, online)
• Creaza: http://www.creazaeducation.com/this-is-creaza/Cartoonist (Free account required, online)
• Prezi: http://prezi.com/ (Free account required, online)
  
• ToonDoo: http://www.toondoo.com/ (Free account required, online)
• GoAnimate.com: http://goanimate.com/videomaker (Paid/free trial, online)

If you have other ideas, please share so I can add them to the list!
Let me know if links are not working so I can update them.