XLBMessui 1.4 is released. XLBMessui is a fast front end for the mess and mame emulator. This program only runs on Linux.

XLBMessui 1.4 Changelog:
Version 1.4 of Xlbmessui has a bug fix that allows it to recognize
the Atari2600 game system as working. *Xlbmessui will take longer
to initialize however once it is initialized it should take the
same amount of time to load.

Download: XLBMessui 1.4
Source:Here