Dropbox

A pioneer in cloud sync, Dropbox excels with its reliable file synchronization and extensive third-party app integrations. Its core strength lies in seamless collaboration for teams through shared folders, comments, and robust version history. Features like Dropbox Paper for collaborative documents and Smart Sync (which shows online-only files) optimize storage space. Targeted at professionals and teams deeply embedded in various software ecosystems, it offers a generous free tier and scalable paid plans.

It ranks high due to its unparalleled reliability, deep integrations, and continuous evolution of team-focused features.