well, vborg has this nice little directory
https://vborg.vbsupport.ru/forumdisplay.php?f=198
and then you can select the version you want to go through, and search specifically in them - no need to search for the version numbers.
vB3.5/6/7 (and presumably, 8) are for the most part similar, and not that impossible to up upgrade between them. Also, most hacks from 3.5 will work okay on 6/7, just not going backwards (of course, some hacks offer specific versions which you should always take advantage of). The point is, itll be just as much work upgrading to vb4 from vb3.5 than it will be from vb3.8, so go ahead and upgrade to vb3.7 for now to take advantage of what you are missing (hacks included) - besides vb4 still seems quite a bit away.