What are some alternatives?
When comparing Koofr and Air Explorer, you can also consider the following products
Dropbox - Online Sync and File Sharing
odrive - odrive aggregates all cloud storage. Access, sync, share, and encrypt everything in one place. Integrations to 20+ storage services, desktop sync, Linux support, placeholder files, zero-knowledge-encryption, web client, advanced sharing, and more!
Google Drive - Access and sync your files anywhere
ExpanDrive - ExpanDrive is a fast network drive and browser for cloud storage.
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
WebDrive - WebDrive File Access Client allows you to open and edit server-based files without the additional step of downloading the file.