Releases on May 15th, 2012 and before

github
cms-sw/cmssw on GitHub CMSSW_5_3_0_patch1
github
FarGroup/FarManager on GitHub builds/3.0.2676
github
cms-sw/cmssw on GitHub CMSSW_5_2_5_patch1
github
ntpsec/ntpsec on GitHub NTP_4_2_7P276
npm
mysql on Node.js NPM 2.0.0-alpha
github
xwiki/xwiki-platform on GitHub xwiki-platform-4.1-milestone-1
github
edx/edx-platform on GitHub archived-branch/pmitros/removing-capa-fs-refs
github
gentoo/portage on GitHub v2.1.10.60 v2.2.0_alpha105
github
qemu/qemu on GitHub v1.1.0-rc2 v1.1-rc2
github
EFForg/https-everywhere on GitHub 3.0development.3
github
skyjake/Doomsday-Engine on GitHub release-1.9.8 build500
Maybe you can find something interesting in this list