For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Higher Logic - Private, secure online communities that stimulate conversation and ignite engagement.
Dropbox - Online Sync and File Sharing
Tribe.so - Tribe is a white-label platform, empowering the new generation of online communities.
Google Drive - Access and sync your files anywhere
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
Mega - Secure File Storage and collaboration