Status of the Resurgent Sith

Sith still confirmed active

Darth Maul
Darth Bane
Darth Tyranus

Sith confirmed dead

Darth Vader

Sith status unconfirmed

Darth Sideous
Exar Kun
Mara Jade Skywalker

Status of the Resurgent Sith

The Darkest Dawn CrankyPelican