Launchers
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While Linux mobile shells are still in a very early stage, touch-optimized app launchers can significantly improve the overall user experience on touchscreen devices while using less memory than a full shell. Some of these close automatically each time an app is launched, so associating them with a particular hardware key on the mobile device might work.
There are several simple Linux launchers available, but none are officially packaged yet:
GTK+
- lxlauncher (LXDE official launcher, gtk2; screenshot)
- Columbiad (very minimal Gtk3 fullscreen launcher; video demo)
Qt
- qml-launcher (qml, closes when an app is launched; screenshot)
Others
- XLunch: Graphical app launcher for X, using pure Xlib and Imlib2, therefore very light and needing only few dependencies (needs entries to be created manually; closes when an app is launched; screenshot)