Here is a list of all modules with brief descriptions:

Nall_vars
Nbcs
Nbinout
Ncontrol
Nenkfval
Neqs_of_state
Nice_albedo
Nice_atmo
Nice_calendar
Nice_constants
Nice_coupling
Nice_domain
Nice_fileunits
Nice_flux
Nice_flux_in
Nice_grid
Nice_init
Nice_itd
Nice_itd_linear
Nice_kinds_mod
Nice_mechred
Nice_model_size
Nice_ocean
Nice_scaling
Nice_state
Nice_therm_itd
Nice_therm_vertical
Nice_work
Ninput_util
Nlims
Nlinked_list
Nm_bndspec
Nm_constants
Nm_diffr
Nm_fileio
Nm_genarr
Nm_obsta
Nm_parall
Nm_snl4
Nm_wcap
Nm_xnldata
Nmod_1d
Nmod_action_ex
Nmod_action_im
Nmod_assim
Nmod_auxiliary
Nmod_bacteria
Nmod_balance_2d
Nmod_bbl
Nmod_binary
Nmod_boundschk
Nmod_bulk
Nmod_clock
Nmod_cnvrt
Nmod_dam
Nmod_detritus
Nmod_dom
Nmod_edit
Nmod_enkf
Nmod_enkf_obs
Nmod_enkfa
Nmod_etkf
Nmod_filter
Nmod_force
Nmod_fvcom2gnome
Nmod_gen_nml
Nmod_gotm
Nmod_grid
Nmod_ice
Nmod_ice2d
Nmod_infovar
Nmod_init
Nmod_input
Nmod_interp
Nmod_interp_time
Nmod_lag
Nmod_meanflow
Nmod_mm5
Nmod_ncd
Nmod_ncdio
Nmod_ncll
Nmod_nctest
Nmod_nctools
Nmod_nesting
Nmod_northpole
Nmod_nutrient
Nmod_obcreate
Nmod_obcs
Nmod_obcs2
Nmod_obcs3
Nmod_onedtide
Nmod_optimal_interpolation
Nmod_output
Nmod_par
Nmod_parallel
Nmod_parameter
Nmod_periodic_lbc
Nmod_phytoplankton
Nmod_prec
Nmod_pro_hurr_model
Nmod_pwp
Nmod_report
Nmod_restart
Nmod_rivers
Nmod_rrk
Nmod_rrka
Nmod_rrkf_obs
Nmod_sed
Nmod_semi_implicit
Nmod_set_time
Nmod_setup
Nmod_sms2grid
Nmod_sng
Nmod_solar
Nmod_spherical
Nmod_sst2grd
Nmod_startup
Nmod_station_timeseries
Nmod_surfaceforce
Nmod_time
Nmod_ts_clim
Nmod_types
Nmod_utils
Nmod_wavesetup
Nmod_wd
Nmod_weather
Nmod_wqm
Nmod_wrf
Nmod_wrf2grd
Nmod_zooplankton
Nmtridiagonal_scal
Nnon_hydro
Nocpcomm1
Nocpcomm2
Nocpcomm3
Nocpcomm4
Noutp_data
Nparticle_class
Nprobes
Nrrkval
Nscalar
Nsegment_class
Nserv_xnl4v5
Nsinter
Nswcomm1
Nswcomm2
Nswcomm3
Nswcomm4
Ntimecomm
Nvars_wave