Xadreco, the didactic free/open source chess engine now has another version for you.
Version 5.7 is a little bit stronger, but still fun to play.
We are slowly moving to a new site. The links are:
http://www.geocities.com/pag_sax/xadreco/
https://codigolivre.org.br/projects/xadreco/
Thanks for your interest!

Beco