The site is here.
What struck me recently is that easiest way to remember German adjectives is:
strong adjectives follow the article (except genitive masculine and neuter, which take -en (and the noun -s)).
Weak adjectives go:
plurals, datives and genitives take -en
fem. and neut. acc. and nom. take -e
masc. nom. takes -e
masc. acc. takes -en.
And that’s it. For some reason I find that easier to remember than a flow chart or the standard tables that follow the article patterns. (Just have to spot the dative verbs!).
Grammar geekdom lives on.