My public source code repository is located here. I prefer MIT license for my public work, so feel free to browse and fork projects, there are minimal restrictions.
A long time ago, I wrote a book on Low Power AM (LPAM) radio, because there weren't any resources available at the time. I am working on transitioning it to a wiki so radio hackers can help me improve the content. I also designed a few AM transmitters, and the schematics for them are available here.