Warzone 2100 is a free, open-source real-time strategy game from 1999. Instead of picking units from a menu, you design them from a body, propulsion, and weapon.
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Warzone 2100 Still Lets You Design Your Own Army
Warzone 2100 is a free 1999 RTS where you design every unit from parts and research more than 400 technologies. It still holds up, and six newer RTS games push the same base-building loop further.