Plugins not showing up on individual sites

Hey all,

I just turned into a multisite install. It's my first multisite and I'm a little confused about plugin management—even though I've network-activated all plugins, none of them are showing up on the individual sites' plugins pages.

Most plugins are clearly available; I can see a bunch of options in the various drops in the Dashboard menu. But both the Plugins page and Multisite Plugin Manager show only one of them.

Any thoughts?