Stellar Monarch is described as 'Turn based, 4X, empire space builder, singleplayer, asymmetric, Emperor focused grand strategy. The game is a fast-paced, turn-based space empire builder with no micromanagement, asymmetric mechanics, and that focuses on you as the emperor'. There are more than 10 games similar to Stellar Monarch for a variety of platforms, including Windows, Steam, Linux, Online / Web-based and Android. The best alternative is Stellaris. It's not free, so if you're looking for a free alternative, you could try FreeOrion or Planet Capture. Other Stellar Monarch like games are Galactic Civilizations (Paid), Endless Space (Paid), Sins Of A Solar Empire (Paid) and Sword of the Stars (Paid).
FreeOrion is a turn-based space empire and galactic conquest (4X) computer game being designed and built by the FreeOrion project. FreeOrion is inspired by the tradition of the Master of Orion games, but is not a clone or remake of that series or any other game.
Galactic Civilizations III is the largest strategy sandbox ever made. Start with a single world and expand across the galaxy through diplomacy, trade, cultural hegemony or military conquest in this single-player or multiplayer 4X strategy game. Represent entire series of Galactic Civilizations games.
It is the year 2405, and human scientists have discovered a new technology that allows travel from star to star at speeds faster than light. But tragedy strikes, as Earth is ravaged by an alien force. The dawning of a new era was stymied by a grim, new reality... Represent entire series of Sword of the Stars games.
The award-winning Space Empires IV Deluxe is the latest edition in the Space Empires series. A grand strategy title in the space 4X (explore, expand, exploit, and exterminate) genre, Space Empires has already found a place in the heart of strategy gamers everywhere.