Arasan is a chess program for Windows, Linux and Mac OS.

The latest version is Arasan 17.4, released in October, 2014.

Arasan has both a native user interface (for Windows only) and a console-based chess engine for use with Winboard or xboard. Arasan also works with Arena, another free chess interface, and with UCI-compatible programs like Fritz and Chessbase.

Arasan includes an opening "book" with over 500,000 moves.

Since version 14.0, the Arasan chess engine has been licensed under the MIT License.