I'm switching all my development over to using Git instead of Subversion, and so I have imported the source code for TileCutter onto Github:
https://github.com/tbentropy/tilecutter
Would you like to fork or move you Simutrans repos to the Simutrans organisation on GitHub [1]? As a member of it you could still fully maintain them (eg by heading the associated team).
[1] https://github.com/simutrans