We have 15 years experience in maintaining GNU/Linux and BSD servers. A few hundred servers have been installed, configured and shaped to perform to the needs of the moment for companies like GeCAD Software and Avira GmbH.
During this interval a large number of applications have been developed and a part of them got an open source license which allows their distribution towards the community.
"laboule" - a client/server software written in bash that supervises dynamic firewalls.
"PXE LiveCD" - ISO images that allow the rapid deployment of servers.
"screencapt" - a project that automates the screen capture of XFree software - without the need to install XFree libraries directly in the server's OS.
"fix_eth_order" - bash script that reorders the network interfaces on a server with static /dev and a monolithic kernel
Contributions have been made to existing Open-Source projects. Amongst them a large number of patches have been sent to SELinux (a kernel module that allows the finegrained control of processes via security policies). As Hardened Gentoo developer a number of software packets have been maintained.