The OpenStad software allows for different e-democracy websites to be created & managed. It supports: single & multiple voting on ideas, submitting ideas, participatory budgeting, arguments, voting and arguments, different authentication methods, managing multiple sites and more.
Initially the software was developed in Amsterdam. It's currently actively used in many different cities, such as Amsterdam, Den Haag, Haarlem & Alphen aan den Rijn.
The ecosystem contains a CMS & sitebuilder that allows for pages to be build from scratch, an API and an admin panel that allows for multiple sites be created, copied and managed.