I find I can replace just about everything Google makes except for Google Docs & Google Sheets. I wish I could find self-hosted, open-source versions of those, which I would install on my own server. I can just use desktop apps and sync the files through my server with git or rsync when I'm the only user (but using multiple clients), but as you're saying about the general public, for sharing with friends and family, Google's solution works so much better....