Katapult is a discontinued free application launcher for KDE desktop environment. Its development ceased in 2008.Katapult allows the user to quickly launch applications or open files by pressing Alt + space and typing the beginning of the file or application name. Katapult doubles as a quick calculator, spell checker, and document viewer. Katapult also evaluates expressions (e.g. "5+1"). The solution appears on the right (e.g. "6").