The best RTS alternative to Command & Conquer is OpenRA, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Command & Conquer and many of them are RTS Games so hopefully you can find a suitable replacement. Other interesting RTS Game alternatives to Command & Conquer are Widelands, Empire Earth, CaesarIA and Age of Mythology.
OpenRA is an open-source reimplementation of Westwood’s Command & Conquer Red Alert game engine, updated to use the hardware acceleration of modern video cards using OpenGL.
Being a Command and Conquer enthusiast since the 80s I tried OpenRA and find it to be very close to CnC
Widelands is a free, open source real-time strategy game with singleplayer campaigns and a multiplayer mode. The game was inspired by Settlers II™ (© Bluebyte) but has significantly more variety and depth to it. Still, it is easy to get started through playable tutorials.
Empire Earth, also known as EE, is a real-time strategy video game developed by Stainless Steel Studios and released on November 23, 2001. It is the first game in the Empire Earth series: Empire Earth, Empire Earth II, Empire Earth III.
CaesarIA is an open source remake of Caesar III game released by Impressions Games in 1998, it aims to expand the possibilities of the classical city-building simulators and to add new features showing the city life. Now the game work with Windows, Linux, Mac, Haiku and Android.
Age of Mythology is based on building towns, gathering resources, creating armies, and ultimately destroying enemy units and buildings. In this way, players are able to defeat and conquer rival towns and civilizations.
Free (as in freedom) open-source RTS Age of Empires engine. Written from scratch in C++, Python, Cython, Qt/QML, OpenGL/GLSL, Vulkan, ...
Dune Legacy is an effort by a handful of developers to revitalize the first-ever real-time strategy game. Based from Dune II
Littlewargame is a medieval-themed HTML5 Real-Time-Strategy game with multiplayer mode and a map editor. It runs completely in your browser without any download required.
Mental Omega is a free unofficial expansion pack for Command & Conquer Red Alert 2 Yuri's Revenge. It started off as a balance modification. After a few years, it had grown into an unofficial sequel.
It's open source RTS game with a lot of features taken from many CnC games, combined together.
Spring:1944 is a WWII themed game based on the open source Spring Engine. Our goal is to create four fully functional sides (US, Germany, USSR, Britain) with period-accurate units and strengths. Realism is a primary design goal, second only to creating a game that is fun and...
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Pro: easy to install but you need the original CD/DVD. Some cheats you can use, for having a good time after working Good graphics, modern resolutions Con: Till now I as not able to play the Funpark missions. Playing as and against dinosaurs.
Overall I recommend OpenRA. But I also own the Originals.