CairoLauncher is a nice graphic applications launcher for gnome under linux. It is presented as an animated list that you can filter by name or personnal tags list. It is also possible to customize it : list order, application color and transparency.
Hi, please read the four lines of quick start guide. The application hides itself when you launch an item. You don't have to launch it again, just unhide with the dedicated shortcut "CTRL+F1" and yes it autocloses if you try to launch more than one instance in the same time. Thanks for your constructive notices (accessibility of help)