What are the different Unity Web-apps that are available?

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http://askubuntu.com – Now that Ubuntu is officially supporting Web-apps I just wanted to know what are the different Web-apps that are available out there. I know the most basic ones just add an icon in the Launcher when the site is opened. I am more interested in useful ones like the gmail-webapp, which manipulates the Messaging Indicator menu. I hope this question serves as a one-stop point similar to the likes of What lenses for Unity are available? What Application Indicators are available? (HowTos)