Up to the top! In case you were interested:
https://bluemaxima.org/flashpoint/ is trying to meet just this need. I think it even has some version of the classic Shockwave site/application.
There's also Archive.org's Flash Software library: https://archive.org/details/softwarelibrary_flash
and http://www.flashgamearchive.com/ but I don't know much about it.