Slipways Classic
Build a vast interstellar empire in 30 minutes flat.
Unciv
Open source 4X civilization-building game
Remnants of the Precursors
modernization of the original Master of Orion
Tidehold
Expand your underwater colony. Ludum Dare 57 entry
PELAGIUM origins
straightforward turn-based strategy
Solus Sector: Tactics
Turn-based space strategy game
Dominus Galaxia: KS Edition
4X space strategy with tactical combat, spiritual sequel to Master of Orion.
Rush for the Ages ⏳
Fast civilizational card game
Cardalaxy
A 4x inspired card upgrading game
Rixas
Rixas - A free and complex 4x game
Gleba (v0.3.4)
A scientifically accurate fantasy world simulator in development
Birth of the Empires
A 4x Turn Based strategy game similar to classics like Master of Orion 2 or Birth of the Federation
Kingdom Hex
Turn-based strategy on a beautiful hex map
Riftborne
A classic terminal based 4x space strategy!
Island Gods
A tiny strategy game made in pico-8
Retro Commander
Post-apocalyptic real-time strategy wargame (RTS).
Orbis Multiplex
A complex simulation oriented strategy and management game on planetary scale
Underfoot Queens
An ant themed 4x/simulation game
Uncivilized
HEXplore, HEXploit, HEXterminate!
Open Realm of Stars
4X turn-based space strategy
Of Rats And Humans
Lead your Rat Colony towards a new Rat era