MKVToolNix 19: MKVToolNix is a free application for editing 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's a very practical tool for those who have HD movies on their PC 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 19.0.0 was released just one month after the release of MKVToolNix 18.0.0 "Duel with the Devil", and seems to add a lot of new features and enhancements, along with several bug fixes and some system changes.
The new MKVToolnix 19.0.0 comes with a new, much more practical GUI that supports editing video color features. The 19 version is the latest update for 2017.
You can see all changes from release notes and of course to
download the application to the platform you want
