Zeplin takes and artboard and creates a hosted, interactive styleguide that is clickable. It's the ideal front-end development hand-off tool. FEDs can measure elements, get colors, fonts, etc.
- Craft is a toolbox by InVision that has some really novel features:
- Automated duplication. Handy for making lists, tables, grids
- Data generators. Names, cities, and custom things (I have one for grade levels and school districts)