VideoToolbox is described as 'allows you to have all your tools easy to access in a beautiful and clear interface. You no longer need to launch Quicktime X or Final Cut Pro to simply extract a picture or convert a movie'. There are more than 25 alternatives to VideoToolbox for Windows, Mac, Linux, BSD and Xfce. The best alternative is HandBrake, which is both free and Open Source. Other great apps like VideoToolbox are Shutter Encoder (Free, Open Source), Wondershare UniConverter (Paid), ffWorks (Paid) and Xilisoft Video Converter (Paid).
HandBrake is an open-source, multithreaded video transcoder – it compresses and converts digital media from one format to another. HandBrake can rip encrypted DVDs with libdvdcss (libdvdcss is installed with VLC media player on macOS, or AnyDVD/DVD 43 on Windows).
Xilisoft Video Converter is easy, fast, reliable, and loaded with features. Its capable of converting videos of all popular formats like AVI, MPEG, WMV, DivX, MP4, H.264/AVC, AVCHD, MKV, RM, MOV, XviD, 3GP, and audio MP3, WMA, WAV, RA, M4A, AAC, AC3, OGG.
Prism is the most stable and comprehensive multi format video converters available and is very easy to use. It can convert video files from avi, mpg, vob, wmv (Windows Media Video formats) and more into avi, asf or wmv files.
myFFmpeg is a simple to use shell application which enables a large variety of users to benefit from the capabilities of the FFmpeg tool. The program offers a comprehensive interface which makes the usage of FFmpeg functions accessible for everyone.
The Mobile Media Converter is a free video and audio converter for converting between popular desktop media formats like MP3, Windows Media Audio (wma), Ogg Vorbis Audio (ogg), Wave Audio (wav), MPEG video, AVI, Windows Media Video (wmv), Flash Video (flv), QuickTime Video (mov)...
iWisoft Free Video Converter can fast convert videos between all popular formats like AVI, MPEG, WMV, DivX, XviD, MP4, H.264/AVC, AVCHD, FLV, MKV, RM, MOV, 3GP, and audio MP3, WMA, WAV, RA, M4A, AAC, AC3, OGG.