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.
Encrypto - Encrypto lets you encrypt files before sending them to friends or coworkers.
Dropbox - Online Sync and File Sharing
EncFSMP - EncFSMP, a program to mount EncFS folders on Windows and OS X.
Google Drive - Access and sync your files anywhere
File Lock PEA - Password-encryption of files and directories. File PEA encrypts files and folders with authenticated encryption to protect confidentiality and integrity. The program uses memory-hard key derivation functions to prevent custom hardware attacks.
Mega - Secure File Storage and collaboration