votes, the library
Currently, the poll application of this website has a few voting methods implemented.
The library “votes” will allow more voting systems to be used. Check it on Gitlab.
You may want the check some related projects from other people:
voting.ml: a voting tool originated from a project at the Technical University of Munich (TUM)
votation.ovh: an application (in French) to create votes using maximal lotteries
Le scrutin de Condorcet randomisé: a Youtube video (in French) from the channel Science4All. The description contains many links to related work.
To Build a Better Ballot: an interactive guide to alternative voting systems.
Modern Ballots: online and offline voting platform using Schulze's method.