Yes. OpenSA is released under Open Source / Community and costs nothing. Neither it nor OpenRA has any paid content.

What do I need to run OpenSA?

OpenRA, which is itself free. OpenSA is an add-on and will not run standalone.

How do I install OpenSA?

The PlayBound Launcher installs it in one click from OpenRA's mods list. You can also install it by hand — full steps are on this page.

Roughly 280 MB, on top of the base OpenRA installation.

Yes. The source is published at github.com/Dzierzan/OpenSA under Open Source / Community.

O

Mod

Swarm Assault remake.

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