Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.
Helium - Helium lets you accept payments by credit card for anything you want to sell online.
Button for Google Calendar™ - See your daily schedule and join meetings in one-click.
PiPer - A DIY Minecraft computer to build gadgets
Calendarist - Time blocking companion for Google Calendar
Pennywise - Cross-platform application to open any website or media in a floating window