Synaptic, GDebi, UpdateStar, AppFresh, UpdateHub, Ubuntu Sources List Generator, Ubuntu After Install, MacPorts, OUTDATEfighter, Kaspersky Software Updater, bauh, Oduso, Just Install, Debian Sources List Generator, Aktualizator, App Grid, PostInstallerF, Appvers, CoApp, R-Updater, RadarSync, Avira Software Updater, Brothersoft Updater, LogicielMac Update, Vulmon Alerts are some alternatives to Software Updater (Canonical).