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I'd like to code it, but I have only basic skills in javascript and html. So it take some time to get me involved. I will check your code on the weekend.

I have another suggestion. How about to add filter for voting power of participants and/or their influence?

Don't worry ahah, the app is in HTML and javascript.
And I have a bit of trouble with javascript (especially asynchronous).

If we filter with voting power and reputation, I think the draw will be less fair. But it can always be added in a kind of advanced parameter

I mean that I know others language like c++ but a long time have no experience with javascript and html

All right. :)