Games like World Wide Hack

A massive multiplayer game, where YOU get to experience being a hacker and fighting other players for money and power. In common: hacker, hacking simulator, science fiction.

A persistent browser MMO set in a 1:1 scale solar system built on real NASA MOLA/LOLA altimetry data, with real orbital physics. In common: sandbox, survival, science fiction.

it's a spaceship management simulation with space and crew combat, planetary visits, anomalous events, quests, and loot! In common: sandbox, survival, science fiction.

Help a kind Hacker protect systems before they go out of control. In common: hacker, hacking simulator.

LifePaths is a browser-based narrative life simulation game. In common: dynamic narrative, science fiction, simulator.

Lurkers is a chaotic 2D multiplayer sandbox where you can build, battle, and survive! In common: sandbox, survival, simulator.

Cataclysm: Dark Days Ahead (aka Cataclysm DDA or CataDDA) is an open source survival horror roguelike set in a post-apocalyptic and fictional New England. In common: sandbox, survival, simulator.

A massively-multiplay world where players work together to build, farm, fish, and solve puzzles to fight back against the infectious Muck. In common: sandbox, survival, simulator.

This is a sandbox / rpg game similar to games like Terraria. In common: sandbox, survival, simulator.

Sandboxels is an in-browser falling sand simulation game, with mechanics such as heat simulation, electricity, density, chemical reactions, fire, and over 500… In common: sandbox, science fiction, simulator.