Right, but I believe the original question was is there a liquid equivalent of D76, not what is a good developer to use. Forgive me if I'm wrong. I gave this some thought, but I don't think that there is a liquid equivalent, because Kodak D76 is a Metol-Hydroquinone developer, and it begins to oxidize as soon as it is put into solution from the powder, having a definite and rather short lifespan. Unless one came up with a divided formula that consisted of two or more parts that would be brought together at developing time, I don't think a manufacturer would want to sell bottles of liquid developer that had a sell-by date on them of a couple of months (or come up with some totally sealed, oxygen-free environment).
Now, I fully believe that there are liquid developers that act a lot like D76, but I don't think you can say they are 'just like' D76 since they won't be m-h based.
If I'm wrong on this, someone correct me.
Best Regards,
Bill Mattocks