Here are the packages with brief descriptions (if available):

Nartylib
Nartys7lib
Nbasys3lib
Nbpgenlib
Nbpgenrbuslib
Ncdclib
Ncmoda7lib
Ncomlib
Nfx2lib
Nfx2rlinklib
Ngenlib
Nibdlib
Niblib
Nmemlib
Nmiglib
Nmiglib_arty
Nmiglib_artys7
Nmiglib_nexys4d
Nnexys2lib
Nnexys3lib
Nnexys4dlib
Nnexys4lib
Nnxcramlib
Npdp11
Npdp11_sim
Nrbdlib
Nrblib
Nrlink_cext_vhpi
Nrlinklib
Nrlinktblib
Nrutil
Ns3boardlib
Nserportlib
Nserportlib_tb
Nsimbus
Nsimlib
Nslvtypes
Nsys_conf
Nsysmonrbuslib
Ntst_serlooplib
Nxlib