Useful list Justin, thanks (I'm still using WP-Footnotes, which is no longer supported but still works).

I share Andrés's frustration, and regularly download block libraries to a test site and try them out on a page to compare and contrast with other libraries. I still feel that block libraries should be more like block frameworks, where you download the ones you want and ignore the rest (as opposed to downloading them all and then having to turn off the ones you don't want on a settings page).

One problem with the one-shot blocks is that they sometimes disappear (which isn't sorta brilliant). With plugins, if I've downloaded them I can still use them if they work (and even fix them when they don't - I use a wiki-style links plugin written for php4, now updated) and sometimes I throw the routines from these small plugins into one larger file to keep things simple. Could I build a block library of my own using the one-shot blocks, I wonder...?