Time Warp
Warping and interpolation of frames to "time warp" input footage.

Speed Changes
Retime a sequence made possible using a single speed parameter.

Frame by Frame
Keyframable retiming for complete control on a frame by frame basis.

Motion Blur
Contains an option to add or remove motion motion blur, as appropriate.

Frame Rate Conversion
Frame rate conversions made easy (Important Note: frame rate conversions are supported only from within After Effects and Combustion.)

Enhance Dark Imagery
Option to automatically enhance dark imagery or imagery with poorly defined edges. In many cases, footage that was difficult to track becomes much more well-behaved upon retiming.

Home Page - http://revisionfx.com/products/twixtor/fcp/#features