Here's a set of free, privacy-friendly online tools you might be interested in trying.
Besides files syncing and management, Nextcloud provides a set of online collaboration tools such as calendars, tasks, audio/video call among others.
Project management tool.
To create, edit, share and work collectivelly on online texts documents and spreadsheets.
Content hosting service that allows to upload and share text online.
Online service for appointment planning and decision making.
Online software to upload and share files securely and privately.
The Disroot app that gather all this tools and other Disroot services.