Glad to recommend some free and Open source PHP game scripts:
Dominant Creature RPG is an PHP/MySQL web (browser based) strategy/MMORPG game. With unique creature and PvP combat system. Currently v0.6 is available and will allow stably setup soon.
You can check out for more info. http://www.phpkode.com/projects/item/do ... ature-rpg/
More free PHP game scripts listed on the page!