Spring is an open-source 3D game engine designed for real-time strategy (RTS) games, written in C++. It supports large-scale battles, pathfinding, and physics, ideal for games like Total Annihilation. Spring targets Windows, macOS, and Linux, with modding support for custom content. Without a visual editor, it suits C++ programmers, with documentation and a niche community. Its GPL license ensures openness, though 2D support is limited. Spring powers community-driven RTS projects, appealing to developers interested in strategy games. Less versatile than Godot, its focus on RTS mechanics makes it unique. Actively maintained, Spring is perfect for hobbyists or teams creating multiplayer strategy titles.