Built and launched Tapestry, a PHP Static Site Generator using the plates template system with a focus on blogging. I used this software for a number of client projects as well as for the products documentation and marketing website.
In addition to building the Tapestry software, I also wrote a couple of quick start projects and plugins as an example of how it could be used along side detailed documentation.
Ultimately however, while the product is sound, the amount of time I had spare to invest in its development and marketing dwindled due to becoming a father and it eventually got put on the shelf with an idea to bring it back off at some point.