Balloting for C++26 as a whole. WG21 ("the committee") has finished the technical work on C++26 in March this year, but it wasn't formally approved by ISO (that approval was supposed to be this ballot). So WG21 will now have to figure out how C++26 can be changed, so that it will be approved by ISO (National Bodies).
P-members are ISO participating members, and O-members are ISO observing members.
https://edg.com/c goes into a bit more details of what it is. You might actually have used it without realising it (for example, IntelliSense in Visual Studio is based on the EDG front end). Some of the companies using the EDG front end are listed on https://edg.com/customers (but some other users are not listed there).
Somewhat related - who came up with the idea of stuffing all that domain verification tokens directly into TXT records for the domain?
Just querying the TXT record of a domain might give you an idea what products a company is using...