ROAC: Probably the most canonical of all the ROCOR remnant groups, and by far the largest. Has the largest presence within Russia of all the ROCOR remnant groups, as far as I can tell.
ROCiE (Mansonville): Archbishop Vladimir of San Francisco and Western America is the only legitimate successor to the first four holy hierarchs of the ROCOR (Metropolitans Anthony, Anastassy, Philaret, Vitaly)
RTOC: Successors of the only recognized Catacomb bishop in Russia (Lazar Zhurbenko)
ROCOR-A: Led by Metropolitan Agafangel of Odessa, who is in communion with the GOC-Kallinikos and the Bulgarian Old Calendarists under Bishop Photius of Triaditza. It's largely due to Metropolitan Agafangel's efforts that there are True Orthodox parishes in Palestine.
ROCANA: Led by Archbishop Andronik of Syracuse, who is in communion with the Serbian True Orthodox under Bishop Akakije.