Today website is must essential in the Company and personaly used many kind of webportal developed by the open source scripting language like php based (google, Facebook)
(Twitter, hulu, Justintv,)Ruby scripting using popular portals is base one of the most open source scripting languages used it!

Open Source Operating systems in many companies are inventing new technologies,
Mobile os is the Android to capture the mobile market,
PC and Laptop in to ocupy the Ubuntu linux(unix) based operating system.
List of the Some Open source Operating Systems :

Open-source software is software whose source code is published and made available to the public, enabling anyone to copy, modify and redistribute the source code without paying royalties or fees. 
Open source code can evolve through community cooperation. 
These communities are composed of individual programmers as well as very large companies. 

Open source doesn't just mean access to the source code. The distribution terms of open-source software must comply with the following criteria:

1. Free Redistribution

The license shall not restrict any party from selling or giving away the software as a component of an aggregate software distribution containing programs from several different sources. The license shall not require a royalty or other fee for such sale.