HandBrake is in my opinion the best video converter available today; I have been using for a long time, and every time I try a different application I am regularly disappointed. The only problem with HandBrake (on the Mac at least) is the lack of a real batch mode: the queue management is great, but you have to select the source files one by one.
Here comes HandBrakeBatch: a fully independent application which uses HandBrake video converter under the hood, and allows you to drag & drop a bunch of files at the same time, and convert them using any of the default HandBrake presets.
The application is free and licensed under GPL (as HandBrake is). The source is available on github.com, and the complete application is available here.
The application includes HandBrake conversion engine, you don't need to download and install HandBrake separately. The best architecture (32 or 64 bit) is automatically selected at runtime.
What's new in this version:
Fixed: Empty language lists in the Preferences.