The comprehensive rigging and animation tool set for After Effects! Duik has been conceived to be as simple and user friendly as possible. However, rigging can be a complex work. Check this plugin by Rainbox Productions.
This is a collection of sites for vector graphic resources which are essential to any designer or developer in the field of designing. Make sure to bookmark this page for more updates on new vector sites. The free vector illustrations in eps, ai format can be very useful as they provide scalability to high quality resolutions for designs.
After effects is an excellent software for compositting (:) lol) - The extra add-on or Plugin make the software more interesting and create very nice effects (damn right it does!)..Plugin is an add-on module which are used to create special effects (ohh...good to know! anyway here's their link below).
Here is another list of plugins for After Effects courtesy of Steven Gotz, who also has a bunch of links about other platforms such as Adobe Encore or Audition. Well worth checking out! Plug-ins AE Flames...etc