Yes, there are several open-source clones of the classic arcade game Asteroids. Here are a few examples:
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Asteroids-Game: This is a simple Asteroids clone written in C++ using the SDL library. The source code is available on GitHub: https://github.com/gchatelet/asteroids-game
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OpenAsteroids: This is another Asteroids clone written in C++ using the SDL library. The source code is available on GitHub: https://github.com/taylorconor/open-asteroids
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Asteroids.js: This is an Asteroids clone written in JavaScript and HTML5 Canvas. The source code is available on GitHub: https://github.com/AdamBien/asteroids.js
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PyAsteroids: This is an Asteroids clone written in Python using the Pygame library. The source code is available on GitHub: https://github.com/arekususan/pyasteroids
These are just a few examples, and there are many more open-source Asteroids clones available on platforms such as GitHub and SourceForge.