SMPlayer intends to be a complete front-end for MPlayer, from basic features like playing videos, DVDs, and VCDs to more advanced features like support for MPlayer filters and...
INA is born to be a modern macOS application, from its framework to user interface.
Celluloid (formerly GNOME MPV) is a simple GTK+ frontend for mpv. Celluloid interacts with mpv via the client API exported by libmpv, allowing access to mpv's powerful playback capabilities.
mpv.net is a modern media player for Windows. mpv is similar to VLC not based on DirectShow like MPC, mpv.net is based on libmpv which in return is based on ffmpeg.