uxdgmenu is described as 'automated XDG Menu system for alternative Linux window managers. It supports currently Fluxbox, Openbox, Awesome, Blackbox, WindowMaker, FVWM2, IceWM, Ion3, PekWM, TWM, support can be added to any other through plugins' and is an app in the OS & Utilities category. There are four alternatives to uxdgmenu for Linux. The best alternative is lxappearance, which is both free and Open Source. Other great apps like uxdgmenu are obmenu (Free, Open Source), obconf (Free, Open Source) and xdg-menu (Free, Open Source).
LXAppearance is the standard theme switcher of LXDE. Users are able to change the theme, icons, and fonts used by applications easily. It also includes support for configuring openbox, via a plugin called lxappearance-obconf.