There are more, fortunately in my archives, like Zeytok's BBLeanMod, bb4win (the original), bb4winmod (by unkamunka) BBClean N.E.B. (by noccy & EliteForce), BBLeanable, BBDeleted, BBLC (older BB effort by grischka) etc... Will upload them as soon as I get everything in line... And maybe we shouldn't forget nivenh's and tres'ni's Bluebox (the first ever with window skinning), or Lithium Desktop Environment by the Mouse People...
Here is what I found so far...
101 downloads This is the late unkamunka's bb4win build. Includes split and mirror graphics, plus block and wave.
BBClean NEB.zip 227.29KB
59 downloads Noccy's and EliteForce's build.
25 downloads The latest build of BBLC by grishka I tested back in 2003. Blackbox.exe only, for historical reasons.
32 downloads BBLeanable, a leaner BB.
Zeytok's BBClean.zip 202.43KB
41 downloads BBClean, the Zeytok version.
38 downloads Bluebox by nivenh and Tres'ni, a different beast, the first to use window skinning long before bbwinskin/bbleanskin.
Lithium Desktop Environment.zip 389.53KB
40 downloads The Mouse People's BB branch, the first to use a menu grip, once a commercial program.
29 downloads Blackbox build that supported pixmap skinning. (Thanks for reminding me, zomby).
23 downloads Grishka's latest BBLC 008.
13 downloads One of the first versions of BBLean.
14 downloads The next of the BBLean series.
18 downloads The last of the BBLean series before 1.16.
Blackbox 29-12-03.zip 165.31KB
17 downloads bb4win, the original, December 2003.
Blackbox_0.0.90b_bs2 Slade Taylor.zip 172.93KB
14 downloads bb4win, the Slade Taylor version. He used to call it "unofficial".
15 downloads The first bb4win build by Blackbox for Windows creator, azathoth.
43 downloads unkamunka's bbmien, added here for grouping purposes. Thanks, zomby.
69 downloads kenaku's build, from a Russian team which used it for commercial situations. Thanks for reminding me, meanmechanics.