Greenshot is a free tool for taking screenshots in Windows. With Greenshot you could capture the entire screen, a window or a specific region. Captured image can be edited by adding annotations, highlights, text, etc. Basically, if you are familiar with Snagit, you will find yourself at home with Greenshot which is a freeware alternative to Snagit screen capturing tool.
MP4Cam2AVI converts MPEG4 files from camcorders, digital photo cameras, cell phones which shoot video in MP4 format) to AVI. Once converted, files could be easily used in various video editors like Windows Movie Maker, Adobe Premiere, VirtualDub or Sony Vegas (for free video editors follow this link). A very important feature of  MP4Cam2AVI Easy Converter is the loseless conversion which means that original files are not recompressed so no quality is being lost.
Supported input formats: *.MP4, *.MOV, and *.AVI.
MP4Cam2AVI doesn't require video codecs to operate, so you don't need to install other things on your computer. If you really need free audio/video converters, have a look here.