Dominik Mahrer (http://www.teddy.ch/) has offered me to host OSM Route Manager and History Viewer, as I was experiencing a lack of resources that forced me to take them offline. Many thanks to him!
The tools are available on the old URLs (http://osm.cdauth.eu/route-manager/ and http://osm.cdauth.eu/history-viewer/ ). Some things don’t work quite right yet (such as the nasty Google Maps API key warning appearing all the time), but at least the tools are usable again.
I am currently working on improving the speed a little bit by using better caching, hopefully it will be as usable as it used to be some day again.