Capsize makes the sizing and layout of text as predictable as every other element on the screen.
Kobold Letters — Why HTML emails are a risk to your organization
cssanimotion lets you create CSS animations visually, by dragging, resizing, rotating, clipping and more, including a keyframes editor
rasterbator.net enlarges images to multiple pages. Print and combine them into huge posters.
Flip plugin lets you seamlessly transition between two states even if there are sweeping changes to the structure of the DOM that would normally cause elements to jump.