Forsaken - Set in modern day San Francisco. The Masquerade, disregarding all other supplements. See webpage for more details. Chargen is open with a brief post-chargen inspection. The game tailored for writers and supports collaborative fiction based on roleplaying through the Granite Chronicle Mailing List and fiction archives at their website.
MUSH claims to be one of the first in the field.
Miami by Night - Accepts all spheres. High emphasis on social interaction and combat. One of the larger games, but many of those are developing roleplayers. Colony in Flames - World of Darkness MUSH set in 1770s Boston, just before the American Revolution. WoD set in San Francisco, California, featuring all spheres, including wraith.