Releases on May 9th, 2012 and before

github
gentoo/portage on GitHub v2.1.10.58 v2.2.0_alpha103
github
qemu/qemu on GitHub v1.1-rc1
github
edx/edx-platform on GitHub xmod-reuse-refactor-skeleton
github
Neamar/KISS on GitHub squeeze-ebook-en-ed1 debian/6.0+20120509
github
cms-sw/cmssw on GitHub CMSSW_4_2_8_SLHCstd2
github
KDE/digikam on GitHub v2.6.0-rc
github
eclipse-vertx/vert.x on GitHub _old/v1.0.0.final
github
apache/jena on GitHub jena-core-2.7.0-incubating jena-tdb-0.9.0-incubating jena-larq-1.0.0-incubating apache-jena-2.7.0-incubating jena-top-0-incubating jena-iri-0.9.0-incubating jena-fuseki-0.2.1-incubating jena-arq-2.9.0-incubating
github
apple/llvm-project on GitHub llvmorg-3.1.0-rc3
github
gentoo/portage on GitHub v2.2.0_alpha102
Maybe you can find something interesting in this list