Klubraum is a modern app for communication and organization of large private groups, like sports clubs, NGOs, etc. Find out more on klubraum.com
This plugin provides a widget as shortcode to be integrated somewhere in your wordpress site.
The widget displays a form through which new members can ask to join the group within the Klubraum app. The user is asked to fill in their e-mail address. Thereafter, an e-mail validation mail is sent, from which the membership request can be finally submitted.