OGame is described as 'strategy-game set in space. Thousands of players across the world compete at the same time. In order to play you only need a web browser' and is an game in the games category. There are more than 10 games similar to OGame for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Android. The best alternative is SpaceHunt Game, which is free. Other OGame like games are Entropia Universe, Xterium (War of Alliance), Vendetta Online and Gratuitous Space Battles.
OGame is mainly a MMORPG Game but alternatives to it may also be RTS Games or Role-playing Games. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of OGame.
SpaceHunt is a chat-based multiplayer adventure similar to Ogame and StarCraft: build a base and go on missions to explore the universe and attack other planets to gather resources and dominate the Universe.
Xterium (War of Alliance) is a strategic space simulator in real time. Fight with thousands of players around the world at the same time to become the best. To do this you will need a regular browser. Learn how to manage a Space Empire!.
Who needs backstory? Who needs resource-gathering? Diplomacy is so last year. Gratuitous Space Battles cuts right to the chase of sci-fi strategy games, and deals with large, completely unjustified space battles between huge opposing space fleets.
You start with your first planet in a big galaxy and expand your empire with more and more planets. At the same time you have to defend yourself against other players, form alliances. All around a nice game and what is most important. No Pay to Win.
Bitfighter is a fast-paced team-based outer-space multi-player combat game. There are many game modes and unique maps. Players can (and do) create maps by using the built-in map editor. Space exploration for warfare, construction, and beyond! It's fast, fun, and frenetic.
Galaxy Reborn: Second Empire is a massively multiplayer online real-time strategy (MMORTS) game for Android and IOS set in space. You compete with thousands of players across the world as you build your empire and prepare to dominate the galaxy!