Boprox is a project mainly written in PYTHON and SHELL, it's free.
boprox is a server&client software that allows you to keep your files synchronized with your own server and access them easily and anywhere. You can also share folders and collaborate with other boprox users.
SourceForge site: http://boprox.sourceforge.net/
Official site (in construction, maybe offline): http://boprox.net/