Command line application and PHP library, providing an election engine with a high-level interface. Native support 20+ voting methods, easy to extend. Support simple elections with ease or billions of votes in low resource environment. Intensively tested and highly polyvalent.

A rust library for tallying votes

JS library for ranked voting systems

Election simulator and election implementation for scored methods, ranked Condorcet methods, IRV, multi-winner, and more.

An Erlang library pertaining to consensus democracy, including Condorcet voting

Schulze voting method Go library

Election Simulator 3000: Monte Carlo simulations of voting methods and metrics under different voter models

ComChoice (Computational Choice) is a large collection of many well-known voting rules and aggregation methods in Python.

A .NET Standard 2.0 library that implements various Condorcet voting algorithms

Automatic design of voting rules using neural networks

Working implementation of the Tideman Ranked Pairs (TRP) Condorcet voting method

PrefVote is to promote ranked-choice preference voting algorithms. Updated with Condorcet voting algorithms, it's descended from the Vote::STV software written which I wrote in Perl originally in 1998 and used by multiple clubs and non-profit organizations over the years for polls and elections.

Analysis and implementational details of rank aggregation methods for combing results of multiple engines to achieve best mAP and P@5,10 values

This plugin allows sorting a list of options by preference of the user, instead of just selecting one.

Voting method exploration/simulation tool

Tideman Election Collection parsed and computed by Condorcet PHP

Compare the results of different voting methods

Collaborative index of preferential voting open-source projects. Related to Condorcet vote method an others.

Specification of a free format, representing an Election and her data (parameters, candidates, votes). The objective of this format is to be easily written and read by a human, with the rigor and precision necessary for ingestion by a program.

A toolkit for alternative voting methods. Initially to support Rankled and Range Ballots for IRV, Boorda, and Pairwise/Condorcet. Future support planned Multi-member methods.