Amazon is running a Holiday Android app giveaway now through 11:59 PM PST Dec 27.
The promotion makes 13 paid apps and games with a combined value of over $45 free to download and use. They include popular titles like Goat Simulator MMO, Lifeline, AVG AntiVirus PRO, SpongeBob Moves and Last Horizon. The full list is here and Apps & Games : Free App of the Day Bundle. The regular price of these apps ranges from 99¢ to $11.99 each.
To install apps from Amazon you need the Amazon Underground App or the older, discontinued Amazon Appstore app installed on your phone. Once you have the Amazon app go to the list of free apps with your phone browser and start downloading. You can also get the free apps by going to the Amazon Appstore with a PC browser, clicking the app you want and then clicking the Get App button. Next launch the Amazon app on your phone and go to Menu > My Apps > Cloud > Refresh to find and install your free apps.