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Collaboration can be a big part of writing projects and this app leverages the Google+ network to good advantage.
It handles text IM and video chats for sessions that work well with the front camera on the Nexus 7.
Google Hangouts can be a good way to have a group video conference and this app makes it easy.
RSS is a good way to conduct online research and this app is designed to fully sync with Google Reader.
The interface is well designed and fully configurable to taste. The two-pane display in landscape is particularly useful on the Nexus 7.
Formerly Read It Later, this app is a wonderful way to capture information of interest on the web for later access.
The interface is well done on the Nexus 7, making this a great research tool for writing projects.
Automatically backs up to Dropbox if desired.