MKVToolNix 20: MKVToolNix is a free application for editing MKV files.
With the free app you can cut a large file into smaller comeyea, or vice versa to join smaller pieces into a larger one. You can save MKV audio to Mp3 and also embed subtitles very easily.
It is a very practical one tool for those who have HD movies on their computer and want to edit them. 
The developer of MKVToolnix project Moritz Bunkus announced the release of the new MKVToolnix 19.0.0. It is a bug fix release of open-source and cross-platform (Windows, Linux and Unix) application of MKV (Matroska).
MKVToolNix 20.0.0 was released just one month after the release of MKVToolNix 19.0.0 "Duel with the Devil", and seems to add a lot of new features and improvements, along with several bug fixes and some system changes.
The new MKVToolnix 20.0.0 comes with a new much more practical GUI that supports video color feature editing. Version 20 is the first information for 2018.
You can see all changes from release notes and of course to
download the application to the platform you want
