MKVToolNix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows.
https://mkvtoolnix.download/index.html
Audio/Video Applications
XMedia Recode 3.5.8.0
XMedia Recode can convert almost all known audio and video formats.
https://www.xmedia-recode.de/en/
Kodi 20.2 “Nexus”
Kodi is an award-winning free and open source (GPL) software media player and entertainment hub that can be installed on Linux, OSX, Windows, iOS, tvOS and Android. It is designed around a “10-foot user interface” for use with televisions and remote controls.
Users can play and view most videos, music, podcasts, games and other digital media files from local and network storage media and the internet.
https://kodi.tv
MediaInfo 23.06
MediaInfo is a convenient unified display of the most relevant technical and tag data for video and audio files.
https://mediaarea.net/en/MediaInfo
PlayerFab 7 (former DVDFab Player) 7.0.4.3 (32/64 bit)
Play any discs (including 4K UHD), local videos, and streaming videos. Organize your movie/music library.
https://www.dvdfab.cn/playerfab.htm
PlayerFab 7 (former DVDFab Player) 7.0.4.2 (32/64 bit)
Play any discs (including 4K UHD), local videos, and streaming videos. Organize your movie/music library.
https://www.dvdfab.cn/playerfab.htm
MKVToolNix v77.0 “Elemental”
MKVToolNix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows.
https://mkvtoolnix.download/index.html
XMedia Recode 3.5.7.9
XMedia Recode can convert almost all known audio and video formats.
https://www.xmedia-recode.de/en/
MakeMKV 1.17.4 beta
MakeMKV is your one-click solution to convert video that you own into free and patents-unencumbered format that can be played everywhere. MakeMKV is a format converter, otherwise called “transcoder”. It converts the video clips from proprietary (and usually encrypted) disc into a set of MKV files, preserving most information but not changing it in any way. The MKV format can store multiple video/audio tracks with all meta-information and preserve chapters. There are many players that can play MKV files nearly on all platforms, and there are tools to convert MKV files to many formats, including DVD and Blu-ray discs.
https://www.makemkv.com
Mp3tag v3.21 (32/64 bit)
Mp3tag is a powerful and easy-to-use tool to edit metadata of audio files.
It supports batch tag-editing of ID3v1, ID3v2.3, ID3v2.4, iTunes MP4, WMA, Vorbis Comments and APE Tags for multiple files at once covering a variety of audio formats.
Furthermore, it supports online database lookups from, e.g., Discogs, MusicBrainz or freedb, allowing you to automatically gather proper tags and download cover art for your music library.
You can rename files based on the tag information, replace characters or words in tags and filenames, import/export tag information, create playlists and more.
https://www.mp3tag.de