Create video file with multiple audio tracks

Question

I have an animated movie in three different languages, each in a separate video file. The picture is exactly the same for each file, only the audio is different.

I want to merge all these files into one, so that I have a single video file where I can switch easily between the audio tracks in VLC.
What software can I use to merge the audio tracks into a single file?

I can use any OS for the job, but my preferred order is: OS X, Linux (Debian/Ubuntu/Mint), Android, iOS, Windows desktop. It's not really important, though, I'll take suggestions for any platform happily.

The only function I really need is the merging itself. Lightweight solutions are a a plus.

Ingo · Answer

I very much like to use the windows version of the MkvToolNix Tools you can find at https://mkvtoolnix.download/downloads.html (There are options for a wide variety of OS).
You can add multiple video files as input, and then choose which video track and which audio tracks you want to merge into a new mkv file. You will just have to make sure you identify the correct delays for the corresponding audio tracks in order to sync audio properly.

Create video file with multiple audio tracks

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