The BBC's Open Source BMX library has been archived and forked into an EBU repo: https://github.com/ebu/bmx/
In this presentation, Thomas Heritage (BBC R&D) explains what BMX is and why the BBC has archived the original repository.
If you want to support, be involved in, have ideas around, etc. the BMX work, then please do not hesitate to contact the EBU via above git or directly via: Frans de Jong ([email protected]).