Show different content for different screen sizes: Computer, tablet, smartphone. Bundled with the Respond Stack that'll allow you to perfect font sizes for all screens sizes. AOne of my own favourites.
'Stick' a stack to the bottom of the BottomStack and make things look nice and organized in a grid like the Hagrid or Sireco Grid Stacks. Bonus Stack: Equal Height Stack (does pretty much the same but with jQuery).
Use the Target Txt & Color Box Stacks (bundle) to adjust settings for groups of default Text Stacks. Wrap it around groups of text Stacks and style all Text Stacks from the Target Txt Stack. Bonus: Space Master & Servant Stack. Take charge of your white space.
Responsive jQuery Stack that allows you to 'stick' a stack to the bottom of the Equal Height Stack throughout a grid / column stack – and make things look nice and organized. Bonus: Bottom Stick Stack (css solution).