Cron - Cron Calendar.
Volition - A self-hosted daily planner that focuses on reflection
KosmoTime - The to do list with super powers
Time Tracking for Freelancers - A simple, fully integrated time tracker for freelancers
Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.
Timist - Track your time, session by session