Mac: Handbrake is is one of the most popular DVD ripping and video converters out there, but it's missing a simple way to convert a lot of videos at once. HandBrakeBatch is a small app that adds batch conversion to Handbrake.
In order to use HandBrakeBatch, you need Handbrake installed. Then, all you need to do is drag and drop the videos you want to convert into HandBrakeBatch, set your output type, and HandBrakeBatch does the rest. It's significantly easier than Handbrake's queue option. Windows users can get the same functionality with Handbrake Batch Encoder.