Octopus is a GUI based KM + key/click/cursor multi window caster basically. It is a server/client in one EXE for maximum response on the server, whilst extending the same functionality to additional clients. The design is such that as much configuration as possible is done on the server. No coding/scripting is required (not using that as a sell point, rather, it is the way it is).
Download (Works on 3.3.5a)