Magnet Window Manager - Magnet Developers
Anima App - Design, get feedback, convert to code, publish, iterate.
Spectacle App - Move and resize windows with ease.
Timeline for Sketch - Create beautiful timeline animations in Sketch
Moom - Move your mouse over the green zoom button in any window, and Moom's mouse control overlay will appear (as seen in the above animation).
Invision - Prototyping and collaboration for design teams