*sigh*
If you search for the sysdeo plugin for developing Tomcat on Eclipse, you’ll find that every link in the blasted world points to the English site, which is now gone.
A little investigation and puzzling out some random french, and I found where it’s now located on the French site. Hopefully if anyone is setting up to do Tomcat development under Eclipse, and they want the Sysdeo plugin (trust me; worth its weight in gold), here is a link.