What are some alternatives?
When comparing Ops Calender and Teamweek, you can also consider the following products
Teamup Calendar - Cloud-based calendaring using capability URL, application developed in Zurich, Switzerland.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Time.ly - Time.ly is a collaborative calendar solution for websites.
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
Google Calendar - Spend less time managing your day & more time enjoying it
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.