This is a plugin package for VoteIT that provides functionality for regular Schulze, STV and PR polls.
Single winner with proper analysis of how each proposal was picked. Use this for most cases where you want a single winner.
More information: https://en.wikipedia.org/wiki/Schulze_method
Use this for elections where you want 2 or more winners. It doesn't rank the winners though, they're only displayed.
More information: http://en.wikipedia.org/wiki/Schulze_STV
Use this if you want to sort proposals according to preference. It has no winner, it only outputs the preferred order of all the voters. It's very computationally heavy, and complexity increases exponentially with each new proposal. Any more than 5-6 proposals may cause problems. Use carefully!