aheheh
well now
XviD binaries released by nic, koepi, and umaniac aren't hacks in any way.. they're compiled binaries from the cvs. There is no liscenced version of XviD, just a bunch of stable and development branches.
LAME was never a hack at all, but just like project mayo's Mpeg 4 spinoffs is a legit implementation of the mpeg 1/2 layer III audio format. Lame is also considered the best mp3 encoder available.
As for XviD and DivX 4, afaik xvid was not born from divx 4, but project mayo bore them both as separate projects with different code. They had the same basis, but DivX 4 and 5 have entirely different code than XviD by now I'm sure. And that statement that XviD looks like DivX 4 is a burn
And it looks like you're asking for the lame acm which works in vfw instead of the commandline encoder, although both are for windows
In which case that exists on both doom9's site and this site in the amvapp.
just look for the lame ACM