Releases in March 2006 and before

github
bminor/binutils-gdb on GitHub msnyder-reverse-20060331-branchpoint
github
root-project/root on GitHub v5-11-01-alice
github
bminor/binutils-gdb on GitHub gdb-csl-sourcerygxx-3_4_4-25
github
wine-mirror/wine on GitHub wine-0.9.11
github
BOINC/boinc on GitHub client_release/5.3/5.3.31
gnome-gitlab
GNOME/vte on Gnome GitLab vte_0_12_branchpoint
github
389ds/389-ds-base on GitHub Directory71Sp2RtmRhelHpuxSolaris
github
lilypond/lilypond on GitHub release/2.8.1 release/2.9.1
sourceforge
gnuwin32 on SourceForge tre/0.7.2/tre-0.7.2.exe tre/0.7.2/tre-0.7.2-src.zip tre/0.7.2/tre-0.7.2-src.exe tre/0.7.2/tre-0.7.2-lib.zip tre/0.7.2/tre-0.7.2-doc.zip tre/0.7.2/tre-0.7.2-dep.zip tre/0.7.2/tre-0.7.2-bin.zip tiff/3.8.2-1/tiff-3.8.2-1.exe tiff/3.8.2-1/tiff-3.8.2-1-src.zip tiff/3.8.2-1/tiff-3.8.2-1-src.exe tiff/3.8.2-1/tiff-3.8.2-1-lib.zip tiff/3.8.2-1/tiff-3.8.2-1-doc.zip tiff/3.8.2-1/tiff-3.8.2-1-dep.zip tiff/3.8.2-1/tiff-3.8.2-1-bin.zip
github
sassoftware/conary on GitHub conary-1.0.10
github
ocaml/ocaml on GitHub 3.09.2-rc1
sourceforge
dosbox/dosbox on SourceForge 0.65/DOSBox0.65-win32-installer.exe 0.65/DOSBox0.65-MacOSX-PPC.dmg 0.65/dosbox-0.65.tar.gz
github
GNOME/glade on GitHub TRISTAN_MERGING_HERE
Maybe you can find something interesting in this list