Free chess software

Lucaschess – About Lucaschess:

The program has 61 engines prepared to play from the start, with strength from 0 to 3300 Elo. This list of engines is not closed and you can add other ones the only limitation is that they use the UCI protocol.

The game can be set, limiting the depth of analysis of the motor or the time used to think, or modifying the way it decides. You can also choose the opening, or start in a certain position, or that the engine uses a book of openings or more or less aid.

Arena – About Arena chess:

Arena is a free Graphical User Interface (GUI) for chess. Arena helps you in analyzing and playing games as well as in testing chess engines. It runs on Linux or Windows. Arena is compatible with UCI and Winboard protocols. Furthermore, Arena supports Chess960, DGT electronic chess boards & DGT clocks, and much more.