MySims Kingdom - MySims Kingdom is based upon The Sims series but provides special and extremely different gameplay to the original series making it definitely worth your consideration.
Rust Game - Rust’s world is harsh. The environment is not kind. Bears and wolves will chase and kill you. Falling from a height will kill you. Being exposed to radiation for an extended period will kill you. Starving will kill you. Being cold will kill you.
Gaia Online - Gaia Online is 3D Social Networking, Virtual World, and Browser-based Simulation.
Arma - Experience true combat gameplay in a massive military sandbox.
YoWorld (Yoville) - YoWorld or formerly known as Yoville, is an Action, Browser-based, MMO, RPG, Single-player and Multiplayer, Social networking, and Virtual World Simulation developed by Big Viking Games.
Infestation: The New Z - Infestation: The New Z is a Free to play, Massively Multiplayer Online Role-playing, Third-person Shooter Horror, Survival, and Open-World video game developed by Fredaikis AB and published by OP Production LLC.