Here are a few projects that I either have done or am actively participating in.

PyroCMS

I'm currently on the development team for this project and quite a bit of my work centers around it as it is my content management system of choice for building sites. A couple of my contributions are listed below. https://github.com/pyrocms

PyroCMS Professional

I wrote the Multi-site Manager for PyroCMS Professional v1.3. It allows Super Admins to create, delete, and manage entire websites for their clients from its interface.

PyroCMS Pages & Navigation

The Page and Navigation interface for PyroCMS allows users to drag the items into the order they wish for them to be displayed in. Multiple levels are supported so both pages & navigation can have parent > child relations.

Newsletters

I'm the creator of the email newsletter module. It allows a site administrator to send email "blasts" to subscribers using a WYSIWYG editor. If configured properly it can send thousands of emails. Read more about it here.

Automotive Inventory Showcase

Another product is the auto galleries module. It is targeted at used car dealers who wish to place their inventory online. It has a simple and fast admin panel that allows anybody to add vehicle listings. View a demo here.

Website Directory

With this a site administrator can easily create a directory of websites. It automatically takes a screenshot of the website and saves it for a preview. You can read about how I created the screenshot generator here.