Free RTS games that are complete games, not demos
Ten real-time strategy games you can play for nothing in 2026 — open-source projects, free-to-play ladders and browser games — with what 'free' actually means for each one, and one famous free RTS that just lost its servers.
"Free RTS" covers three very different things. There are open-source games that nobody will ever charge for, because the licence forbids it. There are free-to-play games where the ladder is free and the rest is a shop. And there are games that are free today because a company decided so, which is a decision a company can reverse.
This list says which is which. Every entry was checked in September 2026, and every one is a complete game: a campaign or a skirmish or a ladder you can play for a hundred hours without a purchase prompt. Steel Tide is included, in its own section, on the same terms.
Open source: free forever
Beyond All Reason is the biggest of them and, on the evidence, the best. It is Total Annihilation's descendant on the open-source Recoil engine: three factions, a streaming metal-and-energy economy, matches that have seated 110 players, and a volunteer team that PCMag credited with "the best RTS release in years". The licence is the GPL. A Steam edition published by Hooded Horse is coming with a paid campaign attached, and the team has said in as many words that nothing currently free becomes paid — the multiplayer stays free through the game's own launcher. Windows and Linux.
Zero-K shares the engine lineage and has been free since 2010, on Steam since 2018: more than a hundred distinct units on a flat tech tree, terrain you can crater and wall with explosives, and a campaign you can play in co-op. It is the one on this list that people who know all the others still recommend.
OpenRA is a GPL re-implementation of the classic Command & Conquer engine: Red Alert, Tiberian Dawn and Dune 2000 fully playable, with modern controls, replays, an observer mode for streaming, and a Tiberian Sun mod in development. Windows, macOS, Linux and FreeBSD. The original games' assets were long ago released for free, so there is nothing to buy.
0 A.D. (Wildfire Games) is the Age of Empires-style historical RTS that spent two decades in alpha and, in February 2026, shipped version 28, "Boiorix", the first release without the word "alpha" on it. Civilizations of antiquity, an in-house engine, multiplayer that is peer-to-peer with no central server, and a licence that mixes the GPL and Creative Commons.
Warzone 2100 was a commercial game from Pumpkin Studios in 1999, open-sourced in December 2004, and has been maintained by volunteers ever since. Version 4.7.0 arrived in April 2026. It is a research-tree RTS with designable vehicles, and it runs on practically anything.
Mindustry (Anuken) is GPL-licensed and free from the developer, on itch.io, on Android and on GitHub; the Steam version costs money and buys you Workshop and the convenient multiplayer. It is a factory game, a tower defense and an RTS in one, and it is on this list because "free" here is a licence, not a promotion.
Free to play: the ladder is free
StarCraft II has been free since November 2017: the whole Wings of Liberty campaign, unranked and versus-AI play with every unit, ranked once you have earned ten first-wins-of-the-day, and the co-op commanders up to level five, with three of them fully unlocked. Blizzard still patches it — a June 2026 balance update cut starting workers from twelve to eight — which is more than most paid games get.
OpenFront.io is free, open source and runs in a browser: a hundred-player real-time territory game with alliances and nuclear weapons, played by, in the team's own figure, around 200,000 people a day. It heads to Steam Early Access on 17 September 2026 with cross-play against the web version. We wrote a full comparison.
Chrono Divide is a free browser re-implementation of Red Alert 2 with ranked multiplayer on the original maps. The catch is that it runs against the original game's files, which you have to bring yourself; the engine is free, the game is not.
The cautionary tale
Stormgate was the free-to-play RTS with the biggest budget the genre had seen in years, from former StarCraft II leads, with a 1.0 in August 2025. In April 2026 Frost Giant announced that online support would end and an offline patch would be issued, because the company hosting its servers had been acquired by an AI firm and was closing its game-server business. The campaign remains playable offline. The ladder does not.
That is the difference between the two halves of this list. A free-to-play game is free while someone pays for the servers. An open-source game is free because the code is yours.
Steel Tide
Steel Tide is free in the plainest sense: open the link and play. No account, no shop, no premium currency, no ads. A base-building RTS with thirty-two units across land, sea and air, a single counter table, a six-mission campaign, three grades of AI, and up to six seats a match.
And the multiplayer belongs to the people playing it. A dedicated server installs with one command on a Linux box, serves the game client itself, and keeps running whether or not we do. That is the closest a browser game can get to the open-source half of this list, and it is deliberate. Start here.