[vitovito]

A friend recommended You Can Book Me, which she's used for office hours: https://gb.youcanbook.me

It's the only alternative I'm considering for a set of group open office hours.

For just you, Doodle has a MeetMe feature which might suffice: http://doodle.com/meetme

[thinkstorm]

Thanks! I will try out https://gb.youcanbook.me/index.jsp and see how that goes, sounds it fits the bill!