Git-Sync is a free & open-source, online/offline, two-way synchronization tool, where any of the copies can be modified independently.
Git-Sync can be used to synchronize folders between several USB hard disks, if you add/remove/edit files on more-than-one drive at the same time, and you want to synchronize the changes and be sure that you have the same contents everywhere. The tool will automatically propagate the changes you made on any of the hard disks, whether you add, modify, or remove the files/folders. I am the original author of the tool.

http://code.google.com/p/git-sync/

Hamachi (v1) keep-alive monitor

Hamachi is a zero-configuration VPN solution. However, the first version of hamachi on Linux was not reliable. It used to crash or deadlock, or simply to stop responding and start consuming 100% cpu time. This tool monitors the hamachi daemon and restarts the hamachi service if necessary. I am the original author of the tool.

http://computarz.blogspot.com/2010/06/updated-hamachi-keep-alive-script.html

The instability problems in hamachi were largely solved in version 2, so the script is now obsolete.

Krusader

Krusader is an advanced twin panel (commander style) file manager for KDE and other desktops in the *nix world, similar to Midnight or Total Commander. I have translated Krusader to Serbian language.

https://projects.kde.org/projects/extragear/utils/krusader

KDE

The KDE® Community is an international technology team dedicated to creating a free and user-friendly computing experience, offering an advanced graphical desktop, a wide variety of applications for communication, work, education and entertainment and a platform to easily build new applications upon. We have a strong focus on finding innovative solutions to old and new problems, creating a vibrant atmosphere open for experimentation. I have helped translate KDE to Serbian language.

http://www.kde.org/