PunBB is a fast and lightweight discussion board. Its primary goal is to be a faster, smaller, and less graphic alternative to otherwise excellent discussion boards like phpBB, Invision Power Board, and vBulletin. It has fewer features than many other discussion boards, but is generally faster and outputs smaller pages.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.