libpng
on SourceForge
libpng17/1.7.0beta89/libpng-1.7.0beta89-LICENSE.txt
libpng16/older-releases/1.6.32beta/libpng-1.6.32rc01.tar.xz
libpng
on SourceForge
libpng14/older-releases/1.4.21beta/libpng-1.4.21rc01.tar.xz
libpng15/older-releases/1.5.29beta/libpng-1.5.29rc01.tar.xz