Helium - Helium lets you accept payments by credit card for anything you want to sell online.
LetterNote - Fine Stationery, Art Prints, Accessories & Collectibles
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
PencilCase - Transform your designs into native iOS apps in a heartbeat.
PiPifier - PiPifier is a macOS 10.
Neonto - Visual tool for creating native iOS and Android UIs