Entropy

Alpha funding! Early access, alphafunding, or paid-alpha is a funding model in the video game industry by which consumers can pay for a game in the early stages of development and obtain access to playable but unfinished versions of the game, while the developer is able to use those funds to continue work on the game.

Entropy is a sandbox science fiction MMOG with a strong focus on freeform gameplay and large-scale space combat, and is available right now for Windows, Mac, and Linux.

Set in a true open-world sandbox, Entropy heralds a new era in community-driven projects, where players will help decide the game’s development direction, helping to build the definitive sci-fi MMO experience.

Minimum system requirements: 

Steam

External links:
Developer: Artplant