Games like FOS on Steam
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Open Sorcery
BEL/S is an Elemental Firewall: a fire elemental bound with C++ code to protect a network of people and places. She can learn things, develop relationships, and even gain sapience. Or she can burn everything with fire. It's up to you.
Deuterium Wars
Deuterium Wars is a rapid 2D shooter. Create your own aircraft and plunge into heated battle with other players. What awaits you: an extensive role-playing system, craft, trading, and much more on a single server for all platforms.
Memories of a Vagabond
You play as a young mercenary and travel from soul to soul to avenge your fiance and her family. While finding a way to change the flow of past events, you will encounter many obstacles and meet new allies. Will you be brave enough?
Dead Horizon: Origin
Most people never get a shot at making a difference. If you did... would you miss? -- Dead Horizon is a short and dirty point and click western themed adventure game that's also completely free.
Onigiri
Onigiri is an MMO Action RPG with a fast weapon changing battle system. Join a party of other players or travel with 8 NPC companions on your journey. With simple controls, you can dive into the thrilling world of Onigiri. Switch between weapons to battle through the Youkai.