Releases in June 2004 and before

github
reactos/reactos on GitHub backups/KJKHyperion-RtlUnwind@12429
gnome-gitlab
GNOME/gnome-terminal on Gnome GitLab GNOME_TERMINAL_2_7_3
github
FarGroup/FarManager on GitHub builds/1.70.1807
github
macports/macports-base on GitHub pre-wbb4-images
github
mono/mono on GitHub MCS_1_0 MONO_1_0
github
bestpractical/rt on GitHub rt-3.2.0rc4
github
bestpractical/rt on GitHub rt-3.3.4 rt-3.2.0rc3
github
FarGroup/FarManager on GitHub builds/1.70.1806
github
reactos/reactos on GitHub backups/ros-branch-0_2_3@12456 ReactOS-0.2.3
github
rocky/remake on GitHub release_0_2
github
exult/exult on GitHub archive/Multimap
github
i2p/i2p.i2p on GitHub i2p_0_3_1_5
github
mono/mono on GitHub MCS_0_97 MONO_0_97
github
bestpractical/rt on GitHub rt-3.2.0rc2
github
lilypond/lilypond on GitHub release/2.3.5
github
GNOME/gimp on GitHub GIMP_2_1_1
gnome-gitlab
GNOME/planner on Gnome GitLab NEW_SCHED_MERGE_1
github
KDE/krusader on GitHub v1.40-beta2
Maybe you can find something interesting in this list