OnTheGo Systems is the maker of WordPress Multilingual (WPML), the industry standard plugin for building and managing multilingual WordPress sites and blogs.
WPML is installed in over 130,000 WordPress sites and blogs.

We are also the makers of Toolset, a plugins package that lets you build entire sites from within the WordPress admin without any PHP.

Almost everyone who buys from us builds websites for clients. This may be a tiny one-man show or a major web development shop. Our products are designed for web developers. Usability, documentation and support are part of the deal. Our products come with the help and support that you need to serve your clients and meet your deadlines.
http://wpml.org/