Are there any solid alternatives to Google Drive/Docs/Sheets/Slides other than OneDrive/Word/Excel/PowerPoint?
It may also help to design a minimum spec to fit your needs, so you don't exclude anything that could work for you, in searching for broader platform-to-platform matches.
Today we're prepping to publish our App to the iOS app-store, which will do local-wifi-photo-synching much like Google Photos, only faster (due to only transferring over local network, not the internet). It's going to be a long battle to catch up with hosted Google Products, but we're on our way.
As for Google Drive, apps like NextCloud (https://kubesail.com/template/erulabs/NextCloud) work really well, though they're not quite as slick as google products. For Google Sheets, there is https://seatable.io/.
Self-hosting software is coming along nicely. All it really needs to get as slick as Google products is more users and more money and more attention. We're hoping to provide exactly that by making it far easier to buy a "Google-Photos-replacement box" (PiBox + PhotoStructure) or a "Slack-replacement Box" (PiBox + Mattermost).
Box’s free tier used to occasionally have 50GB for free offers but file size is limited to 250MB iirc. My family has been using their accounts when this deal was on a few years back and the file history recovery option helped in a pinch where ransomware encrypted both one of their PC + then connected external HDD backup data at once. Also though they have a new sync client “Box Drive” their legacy “Box Sync” client still functions without any major interface or major boot changes one has to learn or get used to (for now).
Update: Sadly no promos now (https://support.box.com/hc/en-us/articles/360043694774-Box-P...) but free personal account signups here with 10GB of storage https://box.com/personal
If you're looking for a self-hosted web-based office suite with a filemanager, OnlyOffice might fit your needs.
If you're looking for an option that's free as in beer, I've got no recommendations for you.
Anything free is probably going to go away once the service has acquired its desired number of users and wants to monetize. You’ll just be in the same spot again.