Assembla confirmed that they no longer allow anonymous SVN access. They stated that anonymous users can still download a zip.
Input on what to do from here is welcome. We could probably switch the autobuilds to get their source via zip download, but my overall impression of assembla hasn't been great for the last few years, so my inclination is to move elsewhere.
github is the obvious default these days, but I'm open to other suggestions.
Autobuilds will need to be updated regardless. I don't know if
@Hacki wants to keep running the mighty-hoernsche.de builds, but I'd be inclined to retire the old TCL scripts.
Switching to git loses the automatic revision number, which is slightly annoying for build identification and script version checking. OTOH, git is probably better for the kind of development we do in many other ways.
Seems stuck @ #6085, should be 6107 today. 
Offers the "stable" build to download, that is 6085 yet.
6085 is the most recent rev on stable. The mighty-hoernsche.de trunk didn't update when I checked in yesterday, so it's stuck on 6112. But it fails early enough that it didn't remove the existing files and post the broken build message, which is good.
The chdkde builds also seem to still be available, on 6107 for the trunk.