NeoSetup Updater!

Chocolatey NuGet is a Machine Package Manager, somewhat like apt-get, but built with Windows in mind. It is built on top of NuGet command line and the NuGet infrastructure.In terms of updates, it allows you to update nearly everything on your machine with a few simple keystrokes.

FileHippo App Manager, previously Update Checker, scans your computer for installed software and checks the versions with http://alternativeto.net/software/filehippocom/ to see if newer versions are available. Versions are neatly displayed in your browser with downloads along with details such as download size.

Synaptic is a graphical package management program for apt. It provides the same features as the apt-get command line utility with a GUI front-end based on Gtk+.

SUMo stands for Software Update Monitor. Thanks to SUMo you'll be able to keep your PC up-to-date by using the most recent version of your favorite software ! Unlike build-in auto update features, SUMo tells you if updates are available before you need to use your software.

Ketarin is a small application which automatically updates and optionally installs setup packages by monitoring web pages for changes. As opposed to other tools, Ketarin is not meant to keep your system up-to-date (like a package manager), but rather to maintain a compilation of all important setup packages which can then be burned to disc or put on a USB stick.

Patch My PC is a small portable application that updates third party applications and Windows updates. It’s critical to keep software up to date to ensure vulnerabilities are patched. There are currently almost 100 third-party applications that Patch My PC can silently update, and the list is growing with each release!

Flexera Software Personal Software Inspector, previously Secunia PSI, is a FREE security tool designed to detect vulnerable and out-dated programs and plug-ins which expose your PC to attacks. Attacks exploiting vulnerable programs and plug-ins are rarely blocked by traditional anti-virus and are therefore increasingly "popular" among criminals.

All software updaters tell you when new versions are available. With Ninite Updater it's just one step to automatically download and install all your updates in the background. Other updaters just give you links to installers which you need to download and run by hand for each and every app.

Apt (for Advanced Package Tool) is a set of core tools inside Debian.

Zero Install is a decentralised cross-distribution software installation system. Other features include full support for shared libraries, sharing between users, and integration with native platform package managers. It supports both binary and source packages, and works on Linux, Mac OS X, Unix and Windows systems. It is fully Open Source.