Umko is a chess engine written by Borko Bošković. The current version has a rating around 2900 points. It can use Gaviota's tablebases and Polyglot's opening books. The engine is Free Open Source Software and is licensed under the GNU General Public License (GPLv3).

Umko does not have its own graphical user interface (GUI), it is a console application that communicates with a GUI via a standard universal chess interface protocol. With the program polyglot, you can also connect Umko to the GUIs which only support XBoard protocol.

The program is written in C++ programming language and can be compiled with GNU C++ compiler for Linux, Android, Windows, and Mac OS X.