nuestrafrontera.org is a wonderful example for open source being used for the greater good of humanity.
It’s a trilingual site, written in the languages spoken in Haiti and its neighboring countries. It uses WordPress as a free CMS platform and WPML to make it run multilingual.
The site was built by Design Intense, a US owned creative services company based in Santo Domingo, Dominican Republic. They adapted WPML by creating a custom language switcher and adapting the theme for each language.
Here is what Design Intense said about this project:
Beginning in 2009 the majority of website projects have been developed using WordPress because it provides clients with the control to maintain the site themselves. The WPML plugin has been a critical factor in the success of our projects. Without the ability to easily build sites in multiple languages, WordPress would not be a viable option. Numerous other plugins were tested but non offered the depth of features nor the level of support that WPML offers.