We have internally used vote tool Snoek. At least 2 new features will be implemented in the hackweek:

• Allow anonymous vote during activities creation
• Add a "send mail" button after an activity has been created, so that all the relevant people in the activity would received a notification mail to attend the votes.

While there are quite some other nice features in the wish list, for example:

• openid support
• password recovery
• refine activities edit ui
• allow vote among a specific user group

...

More details, please see the project link