Privoxy, as an heir to Junkbuster, is an Open Source project and licensed under the GPL. As such, Privoxy development is potentially open to anyone who has the time, knowledge, and desire to contribute in any capacity. Our goals are simply to continue the mission, to improve Privoxy, and to make it available to as wide an audience as possible.
One does not have to be a programmer to contribute. Packaging, testing, and porting, are all important jobs as well.