Thrive

"From the lowly tidepools of your home planet, you will rise to cosmic dominance. At every step, powerful creation tools and deep simulation mechanics will aid your species’ development. Revolutionary Games Studio is the open-source team of dedicated volunteers aiming to make Thrive a reality."

Thrive is a free open-source game for PC, Mac and Linux about evolution made by Revolutionary Games Studio, in which the player guides a species from their origin as a microbe to the space age and beyond. Gameplay is split into seven stages – Microbe, Multicellular, Aware, Awakening, Society, Industrial and Space.

The game is still in heavy development, and only the first stage is available to download, although it's not finished. It's possible to join the team sending the application form here.

Gameplay
Thrive will allow the player to develop a species from a prokaryotic cell to a galactic god and interact with other species created by procedural evolution.

Its gameplay is divided into 7 stages (plus a sandbox mode) with their complexity rising exponentially and the transitions between the being smooth as possible. The player is going to use a range of editors to edit its species and compete with other organisms that evolve alongside you.