FREE Quicktime Movie tool for OS-X
Editor: Features of the FREE tool:

Save frames from any QuickTime playable Movie file.
Convert any image (including PDF, GIF etc) to jpeg with One Click.
Drag-and-Drop, no fussy dialogs.
Shuttle control for finding the exact Frame you need.

Quick, Simple. Great for repeated conversions.
Hot key controls for rapid working.
Save as uncompressed JPEG image.
Any size image supported.
Perfect for use with SupaImage for high-quality de-interlace (see below).

If you buy a license for Quick-snap PRO you also get more features:

Change the size of the saved image with a slider, or by setting an arbitrary width and height.

Select a region of the image to be saved. NEW in 3.0
Change the level of compression for the JPEG file
Choose the method used to scale the image (Simple, bi-linear, pyramid or Bicubic *new in 2.4*) you can free download Quick-Snap PRO 3.2 now.