The FileCloud server is self-hosted and gives me the ability to store and share files, sync across different devices and back-up all documents and photos so that I don't have to worry about security.
overGrive - Complete Google Drive desktop client for Linux
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Syncdocs - Syncdocs syncs folders between all your PCs and Google Docs.
WebDrive - WebDrive File Access Client allows you to open and edit server-based files without the additional step of downloading the file.
drive-cli - Google Drive client for the commandline
ExpanDrive - ExpanDrive is a fast network drive and browser for cloud storage.