Not sure if it covers all of your needs but I think franz can cover quite a lot. https://meetfranz.com/de/
Downside: it's 6€ per month if you want to add an infinite amount of services. The free version only covers three.
I personally have not used it but the people I know who use it seem to be quite happy with it. If you have any concerns about privacy: sorry I can't help you there because I don't use it and have therefore not looked into how it works :)
Not sure if it covers all of your needs but I think franz can cover quite a lot.
https://meetfranz.com/de/
Downside: it's 6€ per month if you want to add an infinite amount of services. The free version only covers three.
I personally have not used it but the people I know who use it seem to be quite happy with it. If you have any concerns about privacy: sorry I can't help you there because I don't use it and have therefore not looked into how it works :)