Here, I try to list all alternatives available in opensources and some basic infos about that and first feeling.

 

SOFTWARE

  Proprietary Opensource LogoLogo Install use More info
I am using it
Office Libreoffice
easy

 some adaptation requested

https://www.libreoffice.org/

Yes, a lot

Chrome Firefox
easy easy https://www.mozilla.org Yes, a lot
Windows Linux Mint not easy easy https://www.linuxmint.com/download.php
Use this for install it from a USB key
Yes, a lot
Android Lineage OS not easy easy https://lineageos.org/ No, need to try
Photoshop Gimp easy not easy https://www.gimp.org/downloads/ Yes, a bit

 

DATA IN THE CLOUD

LogoLogo Proprietary Opensource LogoLogo Install use Info
Docker for Raspberry I am using it
Google drive Nextcloud
not easy

OK

https://nextcloud.com/

yes (here)

Yes, a lot

Email Proton mail   easy easy https://samhobbs.co.uk/2013/12/raspberry-pi-email-server-part-1-postfix¬† yes (here)
No, need to try
 Passwd Auth FF server not easy easy https://github.com/mozilla-services/syncserver No No, need to retry

 

SERVICES

LogoLogo Proprietary Opensource LogoLogo Install use Infos
Docker for Raspberry
I am using it
Youtube Peertube
not easy

not easy

https://joinpeertube.org/

yes (here)

No, need to try

Twitter Mastodont
not easy

not easy

https://mastodon.social/

yes (here)

No, need to try

Facebook Diaspora
not easy

not easy

https://diasporafoundation.org/

yes (here)

No, need to try

Google search Qwant
easy

easy

https://www.qwant.com

No

Yes, a bit

Google map Maps.me
easy not easy https://mapsme.fr/ No Yes, a bit
Whatsapp signal
easy

not easy

https://signal.org

No No