#Videotoolbox

peetzweg

opendisplay

Free, open-source Sidecar/Duet alternative — use your iPhone or iPad as a true second monitor for your Mac over USB or WiFi. Low latency H.264, Retina HiDPI, touch input.

superuser404notfound

AetherEngine

Media player engine for iOS, tvOS and macOS. FFmpeg demux, VideoToolbox / dav1d / libavcodec decode (HEVC, H.264, AV1, VP9, MPEG-2, VC-1), live TV with DVR timeshift, Dolby Atmos passthrough, HDR10 / HDR10+ / Dolby Vision / HLG, inline text + bitmap subtitle decode, plus a lean audio-only path with system Now-Playing. You ship the UI.