This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Spring Roo is a command-line driven productivity improvement tool for developing Spring-based enterprise applications. I'm not sure how many companies are using but I'm sure a lot of architects and developers are using it.