Releases in April 2003 and before

github
doxygen/doxygen on GitHub Release_1_3_20030430
github
michaelrsweet/htmldoc on GitHub release-1.8.24b4
github
phppgadmin/phppgadmin on GitHub REL_3-0-0-DEV-4
freedesktop-gitlab
mesa/drm on Freedesktop GitLab texmem-0-0-1-20030429-merge
github
FarGroup/FarManager on GitHub builds/1.70.1644 builds/1.70.1643
github
GNOME/rhythmbox on GitHub RHYTHMBOX_PRE_SOURCES
freedesktop-gitlab
mesa/drm on Freedesktop GitLab texmem-0-0-1-20030429-premerge
sourceforge
sevenzip on SourceForge OldFiles/7z230b31.exe OldFiles/7z230b31s.tar.bz2 OldFiles/7za_dll_230b31.zip OldFiles/7za230b31.zip
github
FarGroup/FarManager on GitHub builds/1.70.1642
gnome-gitlab
GNOME/vte on Gnome GitLab vte_0_10_27
github
openscenegraph/OpenSceneGraph on GitHub OpenSceneGraph-0_9_4-2
github
bestpractical/rt on GitHub rt-3.0.2pre4
github
secdev/scapy on GitHub v0.9.12.1 v0.9.11.5 v0.9.11.4
github
bminor/binutils-gdb on GitHub binutils-2_14-branchpoint
freedesktop-gitlab
mesa/drm on Freedesktop GitLab FreeBSD-20030424
github
FarGroup/FarManager on GitHub builds/1.70.1641
github
znuny/Znuny on GitHub rel-1_1_0_rc2 rel-1_1_0-RC2
github
secdev/scapy on GitHub v0.9.11.3
github
FarGroup/FarManager on GitHub builds/1.70.1640
Maybe you can find something interesting in this list