LibNDI

Open-source, cross-platform and maintained.

Dependencies

Ffmpeg: libavcodec, libavformat, libavutil
Bonjour (MacOS and Windows)
Avahi (Linux)

Acknowledgements

This library is based on the work by Jean-Baptiste Kempf (https://code.videolan.org/jbk/libndi).

License

LGPL v2.1