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.
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Dropbox - Online Sync and File Sharing
TextMe - TextMe is a free calls and messaging application at both local and international levels.
Google Drive - Access and sync your files anywhere
Talk360 - Talk360 is a best-in-class communication utility that offers a convenient way to connect with loved ones globally.
Mega - Secure File Storage and collaboration