M+GUI v1.5.6 (r5058) is compiled. M+GUI new GUI is a stand alone front-end, with similar functionality and interface as MAMEUI.Currently available for Windows and Linux/x11 platforms. M+GUI can automatically download ROMs from FTPs, moreover, it merely downloads the missing roms inside a zip file, resulting a much lower bandwidth consumption.

M+GUI currently supports the following MAME builds: MAME, MESS, SDLMAME, SDLMESS, MAMEPlus

M+GUI v1.5.6 changelog:
1.5.6
fixed reading listxml (changed to QByteArray from QString)

Download: M+GUI v1.5.6 (r5058) fixed
Source: Here