https://www.afterdawn.com/software/audio_video/video_tools/imagompeg_muxer.cfm
This small tool will multiplex MPEG elementary video and audio streams into one single MPEG program stream or VOB stream. It can mux multiple audio including...
software downloadsmuxerfreewareafterdawn
https://github.com/SublerApp/Subler
MP4 muxer and editor, can add tx3g subtitles, video, audio and chapters tracks compatible with QuickTime - SublerApp/Subler
githubmuxereditoradd