It’s the sony one - latest pr is https://github.com/openhab/openhab-addons/pull/6884
Original PR is (way back in 2016): https://github.com/openhab/openhab-addons/pull/1249
Some stats: 322 files (most of them are DTOs), 52k lines (code+doc+whatever), resulting jar file is 1.8MBish in size - it’s huge 
EDIT: link to the forum we discuss this binding with: Sony Devices Binding