As far as I know NubiPlus was never released as freeware by the original developer but it's indeed floating around the net for download. But I might be wrong and it has been released into freeware. If so let us know
I'm going to do delays next and I need suggestions. I have most of the usual suspects (Echomania, TAL DubII, Retrodelay, etc.) but the commercial delays that I have are the Lexicon PSP42, PSP84 and OhmBoyz. They are all hard to beat feature-wise so I'm not sure there is free stuff to replace those.