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Thanks for all the donations so far – and the race is still open, if you haven't contributed yet.
www.startnext.com/jem-for-joomla4

Paypal is an fast and easy way to make an "anonymous" contribution.
Who cares how the money is transferred as long as the goal will be achieved.
Use as many payment channels as possible with a link on the website.
Invite all JEM users to make a small donation with a simple mouseclick. 
I have paid €50.= with Paypal. Buy yourself a beer if you're not using it for the JEM4 project.

Thank you!
Of course this is possible too. Some people just want to know the purpose and goal of their donation and we have a specific project.

I think a help to develop JEM for Joomla4 can be: github.com/astridx/boilerplate/wiki
 

Very nice, thank you!

The link on github was outdated. Then new ones:
German: blog.astrid-guenther.de/der-weg-zu-joomla4-erweiterungen/
English: blog.astrid-guenther.de/en/der-weg-zu-joomla4-erweiterungen/

Hello and thank you for this discussion.
Sorry to take the counterfeit but why put as much investment (time, energy, money) while other projects do this work and are carried by excellent developers?
I personally migrated my sites with JEM under DPCalendar or iCagenda.
The developer of DPCalendar contributes greatly to the heart of Joomla! and we can see that its extensions fit perfectly with Joomla! For many years. for developers and integrators, it is therefore easy to use override to adapt the extension to its needs or those of its customers.