Below is a (hopefully complete) list of people currently contributing to stellarcollapse.org.

California Institute of Technology:
Christian David Ott
Ernazar Abdikamalov
Evan O'Connor
Christian Reisswig
Fang Peng
Jeff Kaplan

Princeton University:
Jeremiah W. Murphy

Niels Bohr Institute:
Christopher Pethick

Stony Brook University:
James M. Lattimer