Chess Programs and Books for free


Scid vs PC is the best free chess database program. I use it create a database of my serious (ie slow time control) games, then review them with the Stockfish chess engine to see if I have made any tactical mistakes.
Stockfish is the best free chess engine which is actually one of the strongest chess engines available, free or commercial.
Arena Chess is a nice free chess GUI. I use it to experiment with various engines and to log into freechess.org.
Hello everyone,
I would like to improve my chess skills. Any recommendation for free chess programs or books? I am looking forward for your answers.
Cheers!