Sindre’s been working on a color palette file format, and has a new color palette management app (both Mac and iOS) that works with it:
It’s simple, but I’ve been really liking it. There’s always been heavyweight palette apps for fancy graphic designers, but this is a straightforward, document-based kind of interface that works for me.
This part isn’t new, but it’s also worth mentioning one of Sindre’s other free apps, System Color Picker. I like it as well: