VideoToolShed

Free
When you have to transcribe a file and have the need to paste timecodes into your document, this is the application to use.
Free
Edit, time and generate subtitles and/or cc to video DVD or broadcast.
Free
LoudnessChange is an application that allows you to mix audio files.
Professional subtitle / CC preparation and render toolset.
Free
It is compatible with QT files created by Nikon or Canon cameras.