Ardour

Record, Edit, and Mix on Linux, macOS and Windows. Ardour's core user group: people who want to record, edit, mix and master audio and MIDI projects. When you need complete control over your tools...
Language(s): C++ (with a little C and assembler thrown in where it makes sense)
Operating system(s): Linux, Mac OS, Window
License: GNU General Public License v2

VLC media player

VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols. VLC has the most co...
Language(s): C, C++, Objective-C
Operating system(s): Windows, Windows Store, Windows Mobile, Apple Platforms, Mac OS X, iOS, Apple TV, GNU/Linux, Debian GNU/Linux, Ubuntu, Mint, openSUSE, Gentoo Linux, Fedora, Arch Linux, Slackware Linux, ALT Linux, Red Hat Enterprise Linux, Android, Chrome OS, FreeBSD, NetBSD, OpenBSD, , Solaris, QNX, Syllable, OS/2
License: GNU General Public License Version 2