Hey everyone!

So, I’ve made some small progress in switching things up on my Android:

Replaced  Gmail app with Thunderbird
Replaced Google Calendar with FOSSify Calendar
Replaced Google Play Store with Aurora & F-Droid
Replaced  Android file manager with FOSSify File Manager
Replaced  Android keyboard with Heliboard

But now I’m hitting a wall trying to find  ones on root of problem:
free replacement for Gmail
free Google Calendar alternative that works well
 on both Android and via Thunderbird    Windows 

Self-hosting isn’t really an option for me, so I’d love to hear your suggestions!

If you’ve found something you really like, please share your experiences.

Thanks!