Voiden evolved from an internal tool where the team bundled a lot of features into the core product. Currently separating certain things into plugins. By the time that is done, and some community adoption/engagement is happening, the tool will be open-sourced.
As per the plugins, that's right. Some of the plugins can/will be monetized - but that's the discretion of the plugin developers. We won't be charging for any plugins that we build, unless they have an operational cost for us.