Editing / Manipulation:
1. GIMP - https://www.gimp.org/
2. Inkscape - https://inkscape.org/
3. Waifu2X GUI - https://github.com/AaronFeng753/Waifu2x-Extension-GUI
4. DaVinci Resolve - https://www.blackmagicdesign.com/products/davinciresolve/

Playback:
1. VLC - https://www.videolan.org/vlc/
2. mpv - https://mpv.io/
3. MPC-HC - https://github.com/clsid2/mpc-hc
4. Syncplay - https://syncplay.pl/