It has been a few years since the last G4KLX update and whilst there are a couple of yahoo groups (pcrepeatercontroller and ircDDBGateway) the latest information is not easy to find.
It appears that Jonathan Naylor's (G4KLX) good work is being carried on by Hans Barthen (DL5DI) and the source code is still maintained and accessible via Hans' GitHub repository.
The repository contains the source code for DStarRepeater and ircDDBGateway in their respective folders.