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Aika - A simple alternative to Google Calendar for timeblocking/timeboxing.
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
Pilorama - Advanced timeboxing tool
Focus App - New Tab page that gives you a moment of calm and inspires you to be more productive.
My Daily Planner - Organize your day with pen & paper. Free printable template.
Go Fucking Work - Website blocker so you can get back to your fucking work