MKVToolNix 18: MKVToolNix is a free application for processing MKV files. With the free app you can cut a large archive into smaller pieces, or vice versa to join smaller pieces into a larger one. You can save the MKV audio to Mp3 and also embed subtitles very easily.
It is a very handy tool for those who have HD movies on computer them and want to process them. 
The MKVToolnix developer project Moritz Bunkus announced the release of the new MKVToolnix 18.0.0. It is a bug fix release of it open-source and cross-platform (Windows, Linux and Unix) application of MKV (Matroska).
MKVToolNix 18.0.0 "Duel with the Devil" was released just one month after the release of MKVToolNix 14.0.0 "Flow", and seems to add a lot of new features and improvements, along with several bug fixes and some system changes.
The new MKVToolnix 18.0.0 comes with a new, much more practical GUI that supports editing video color features.
You can see all changes from release notes and of course to
download the application to the platform you want
