There are only ancient versions. The whole code is ancient. And I have a great dislike for software that does not use autoconf. The killer reason that I don't use nn anymore is that I moved to a new news server a while ago, and nn was incompatible with it. Besides, nn is too bloated.
Bloated software is a bad thing.
Programs get bloated over time. Software tends to carry tons of dead code with it. SLRN is small and fast. SLRN can use colors. SLRN is configurable.