GNOME Network Manager (NM), including components network-manager-gnome
and network-manager, is a front-end to Wireless Tools for Linux
(command-line utilities iwconfig / ifrename / iwgetid / iwlist / iwpriv
/ iwspy).  Widely felt dissatisfaction with NM's baroque architecture
and excessive dependencies has fueled development of alternatives.  Each 
of these is a utility for managing multiple wireless profiles.



Wicd aka Wireless Interface Connection Daemon: wicd / wicd-kde /
wicd-gtk / wicd-cli / wicd-curses.  http://wicd.sourceforge.net:  

ConnMann aka Connection Manager:  connman / connmanctl / cmst (Qt) /
connman-ncurses (simple ncurses client), connman-notify (event
notification client) / ConnMan-UU (GTK3 client) / EConnman
(Enlightenment client),  Depends on wpa_supplicant for WiFi, bluez for
Bluetooth.  https://01.org/connman

netifd:  Developed by OpenWRT.  It's a daemon that listens for
kernel netlink events.  I don't have much information about it and its
utility outside OpenWRT.

wpa_supplicant / wpa_cli / wpa_gui

Wifi-Wiz:  wifi-wiz.  Python / python-gtk.  Developed for Debian.
Appears to be unmaintained.

getwifi:  console tool, connects to the first available network listed
in configuration file /etc/getwifi.conf.

Wireless Assistant:  wlassistant.  C++, depends on Qt, kdelibs.  Depends
on wpa_supplicant.  Appears to be unmaintained.
http://sourceforge.net/projects/wlassistant/

wifi-radar

GTKWifi

ceni

netctl

netcfg

netGo:  depends on Qt.  Appears to be unmaintained.

netgo_ng:  Rewrite of netGo for KDE 3.5.  Appears to be unmaintained.

wifi-select