Hell Rising
Hell Rising is a free online browser-based MMORPG inspired by, and very similar to, Urban Dead. Hell Rising began on Feb 2, 2007, with game concepts and ideas steadily being tweaked or added over the following years.
The main differences between Urban Dead and Hell Rising include the appearance of vampires along with the usual survivors and zombies(making it zombies VS vampires VS humans), an expanded roster of location and item types(the game itself includes over 666+ items) - even including over 200 clothing options, a smaller game world whose different maps carry different methods of play, the addition of a central power plant that controls the electricity in all the main neighborhoods, and a greater degree of flexibility and capability in most other elements of the game (e.g. groups, items, communication, etc.). Notably, action Points also regenerate faster on Hell Rising, at a rate of 4AP per minutes on weekdays and 6AP per five minutes on weekends.
The game also features NPCs of various races/types, a crafting system, players can use banks to store personal items, group storage for everyone in their group, cell phones so players can SMS their mutual friends, weekend and holiday events(some NPCs will only spawn at this times and have special item drops, and much more features.
For additional information regarding Hell Rising, please see the official website.