GGTwitter makes it very easy to authorise your player with Twitter and post messages. Authorisation data is stored so that the user only has to login the first time.
GGData is a simple persistent data storage class for your game or app. Currently it supports the Corona SDK and Love 2D.
GGRating makes it very easy to include a nag-screen or popup in your app to solicit ratings and reviews from your users.
GGSound allows for easy management of sound effects and global volume in your Corona SDK powered apps.
GGColour makes it very simple to used named or hex colours in your game or app. You can also create custom colour palettes that you can swap out whenever you want. Colour values liberated from here - http://www.tayloredmktg.com/rgb/
GGMusic allows you to play a list of background music tracks in linear or random order in your Corona SDK powered apps.
GGFonts makes it easy to work with custom fonts across both iOS and Android by taking away the need to know which platform your app is on.
Makes working with HID controllers ( Ouya, GameStick, Nvidia Shield etc ) much simpler.
Scoreoid is a 'non-restrictive, reliable and easy to use server platform for game developers' and GGScoreoid makes it easy to use in the Corona SDK.
GGStick is an easy to use virtual thumb-stick module for games. You can have as many as you like all playing nicely together.
GGDictionary allows for multiple 'languages' to be included in your Corona SDK powered apps.
GGScene manager is an easy to use scene management class. It has plenty of transitions, with more that can be added, and is very easy to use.
GGChart allows for easy creation of Google Image Charts for your Corona apps. The Google Image Chart API was deprecated in April 2012 however it should still work. Info is here - https://developers.google.com/chart/image/
This is a GGified version of the Tar module for the LuaRocks project provided here - https://github.com/keplerproject/luarocks/blob/master/src/luarocks/tools/tar.lua
GGScore allows you to create easy to use leaderboards for your Corona SDK powered games.
GGFacebook makes connecting and posting messages or images to Facebook very easy. More functions will be added in the future. You must have a Facebook app set up with SSO enabled, see this tutorial - http://www.coronalabs.com/blog/2012/01/04/implementing-facebook-single-sign-on/