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.
Dropbox - Online Sync and File Sharing
EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Google Drive - Access and sync your files anywhere
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Mega - Secure File Storage and collaboration
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.