Lc0 is described as 'Open source neural network based chess engine' and is an game in the games category. There are 2 games similar to Lc0 for Windows, Android, iPhone, Linux and Mac. The best alternative is Stockfish, which is both free and Open Source.
Stockfish is one of the strongest chess engines in the world. It is also much stronger than the best human chess grandmasters. It's open source and available across multiple desktop and mobile platforms.