I noticed that MyData Global uses Doodle for planning of meetings. Now that Doodle is both a paid service AND leaking information to Google and others, I came across DUDLE, an open source application developed by the PrimeLife EU project, that is available as a freely accessible service from Technische Universität Dresden. It can also be used for general polls where it features homomorphic encryption of the votes, so that participants cannot see each others indididual votes.