@ErikJonker@mastodon.social there is a bunch of possibilities: Browser : Chromium/Firefox.
Mail client : Thunderbird
Mail service : self-hosted (Mailcow).
Office software : Collabora 
Video conference : OpenTalk 
Desktop OS : Linux.
Social : Mastodon
Messenger : Matrix/Element 
Projektmanagement : OpenProject
Files : Nextcloud 
VPN : WireGuard Objectstore: Minio 
Etc. Etc.
All selfhosted in data centers running on 100% decentralized produced renewables 😎 @collective_zero@ipv6.social