Shredder is available for Windows, Mac, Linux, iOS, and Android. Free and Legal Chess Alternatives
While Chess.com has premium tiers, its free version allows you to play against humans, play against various AI bots, and solve a limited number of puzzles daily. 3. Lucas Chess
Your purchase funds future updates and the development of stronger chess artificial intelligence.
Stockfish is open-source and widely considered the strongest chess engine in the world. You can download it for free and load it into any free Chess GUI (Graphical User Interface) like Arena or Tarrasch.