What's hard to distinguish? These are projects that do something with CSS. If you don't need css, you skip them. If you need a polyfill, you only look at polyfill ones to see what you need.
Now, let's imagine your list is "creatively" named like
- shelob
- arcana
- custard
- escalope
- virtuocsso
- jester-css
- etc.
Ah yes, this is so much easier to distinguish, isn't it?