Helium - Helium lets you accept payments by credit card for anything you want to sell online.
Streaks - The to-do list that helps you form good habits.
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
Taskful - Deadlines, meet your match.
PiPifier - PiPifier is a macOS 10.
ToDoList - Windows desktop application to stay on top of your daily tasks.