Voting system/engine for customers?

Question

I'm talking about some web thing like http://uservoice.com/ Can you suggest any other similar service, web-site or may be (even better) a ready engine for deployment on own server?

Actually, the question more about systems, which can be installed on your own server.

Answer 1

You might want to try IdeaTorrent as used on Ubuntu Brainstorm site

Answer 2

TenderApp seems to have a lot of the same features, but it's also SaaS.

KBPublisher can be installed on your server.

By the way, most of these SaaS systems like UserVoice will let you forward your own domain/subdomain to their service and apply custom branding, so the experience to your end user is very similar to being on your actual site.