Addoncrop - Extends the functionality of your web browser
SimpleExtManager - A simple menu to enable, disable and access options of extensions.
Chrome Extension Downloader - Chrome Extension Downloader is the name of a website dedicated for downloading and Chrome extensions.
Extensions switcher - Menu for quick extensions control
Opera Add-ons - Get extensions and themes for the http://alternativeto.net/software/opera browser.
Chrome Web Store - Chrome Web Store is an officially recognized application store being developed and managed by the Google.