Just Install - just-install - The stupid package installer for Windows.
Scoop - A command-line installer for Windows
Windows Remix - Web-based batch software installer with zero dependencies. Recommended first visit after reinstalling Windows or buying a new laptop.
App Grid - App Grid is an alternative to the Ubuntu Software Center.
EMCO Remote Installer - EMCO Remote Installer allows you to perform remote installation and uninstallation of EXE setups and MSI/MSP packages and to audit installed software.
AppShopper - Mac Apps, Mac App Store, iPad, iPhone and iPod touch app store listings, news, and price drops