Spring (formerly known as TA Spring or Total Annihilation: Spring), is a full 3D free/open source RTS game engine originally created by the Swedish Yankspankers, intended to bring the gameplay experience of Total Annihilation into three dimensions. The core game engine is licensed under the GNU GPL.

Spring is designed to be played as online multiplayer matches. It uses a deterministic game simulation which is executed on all game clients.

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