Streaks - The to-do list that helps you form good habits.
iStat Menus - "An advanced Mac system monitor for your menubar."
Taskful - Deadlines, meet your match.
iStatistica Pro - System monitor. Reinvented. 💻 🖥
ToDoList - Windows desktop application to stay on top of your daily tasks.
Stats - Simple macOS system monitor in your menu bar.