Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
Aika - A simple alternative to Google Calendar for timeblocking/timeboxing.
Go Fucking Work - Website blocker so you can get back to your fucking work
Zonebox - Get more done by timeboxing your tasks
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Is Invisible - Hard to find, beautifully designed products