Whale3 is a web application dedicated to collective decision making and every day life voting. It should help you to choose collectively amongst several alternatives. For that you can create a poll (open or sealed ballots), tell people to vote, and visualize the results.
Whale3 allows you to choose amongst several preference expression modes (ordinal, qualitative, approval, numerical), and is based on voting theory to enlighten your decision.
Whale3 is a free project: you can download the source code and use it as you wish to.