Open Flash Chart, is open source. It is free to use and you get the source code to fiddle with!
AlivePDF – ActionScript 3 Open-Source PDF Library
AlivePDF is an open-source ActionScript 3 (Flash, Flex, AIR) PDF generation library. It allows you to generate PDF’s client-side.
AlivePDF is licensed under the MIT License. In other words, you can do whatever you want with it.