Single Sign On option?

[FTW]

I know Coppermine has "some" bridges and I have used them in the past with forums, however I would like to find out if anyone has used a SSO with Coppermine, so the users can utilize a CMS ( like backdrop), Forum (like phpbb) and other specialty programs (like Webtrees genealogy) on different servers, without having to sign in separately for each site?

I would appreciate any information that will let me know if this is or will be possible in the near future and if so, a link to additional information.

I have found multiple SSO programs on GitHub and prefer to use the ones based on PHP instead of Java.
Thanks
FTW