SyntaxHighlighter project originally started in 2004 by Alex Gorbatchev and has evolved ever since. The project has seen some great success and have gained a few big name users over the years. From the start it was an open source project and while the core code has seen few contributions and was mostly maintained by Alex Gorbatchev, there’s been a number of brushes contributed.
The original SyntaxHighlighter is still hosted on Google Code, however it’s no longer an active project. If you have pages with older 1.5 version, but still would like to start using newer version, I’ve got you covered too! You don’t have to go back and update all your old pages. Simply follow this handy upgrade guide.