RiMusic
Open source multilingual Android application for streaming music from YouTube Music
iSpy - Open source camera security software
iSpy - Open source camera security software. iSpy provides security, surveillance, motion detection, online access and remote control
MythTV, Open Source DVR
MythTV is a Free Open Source digital video recorder project distributed under the terms of the GNU GPL.
Motion - Open source security camera software
Open source security camera software to monitor and record video from IP, cctv, webcams and even the PI camera
Kap - Capture your screen
An open-source screen recorder built with web technology
VueTube
LosslessCut
Programmer, traveller, photo & videographer
mpv.io
a free, open source, and cross-platform media player
SMPlayer - Free media player
SMPlayer is a free media player than can play virtually all audio and video formats. It can even play and download Youtube videos. Other interesting features: find and download subtitles, thumbnail generator, resume playback.
Asciinema.org - record and share terminal sessions
Vokoscreen - Screencasts for Windows and Linux
Fluid Player
Fluid Player, the VAST ready open source HTML5 video player
Olive
Shotcut
Shotcut is a free, open source, cross-platform video editor for Windows, Mac and Linux
VideoLAN
VLC: Official site - Free multimedia solutions for all OS!