[k__]

Are there any lightweight CSS frameworks with cards?

[bodytaing]

If you are referring to a layout that has a card UI like what Pinterest has, this can be built with almost any grid.

See the "Grid" section of Vital: http://doximity.github.io/vital/components/

It's just a matter of styling the elements within the grid. I'm working on adding some layout examples to Vital.