openMSX Catapult is an optional part (a subproject) of openMSX, the MSX
emulator that aims for perfection. With Catapult you can control openMSX via
a graphical user interface. A release of Catapult is compatible with the
current release of openMSX. The project is not being developed anymore, but we
will try to keep it working to make working with openMSX more convenient. We do
have plans to create a brand new openMSX control program.