There is a never alpha version of leafnode-2 as in portage.
FWIW, the changelog: http://www.dt.e-technik.uni-dortmund.de/~ma/leafnode/beta/ChangeLog.txt Most notably, some needed fixes for applyfilter.
Seems there were several more alpha releases.
No new alphas since 2009, no real maintainer, old alphas were removed from tree. I don't see any reason to reanimate that.