In fact, I'm using the new Office 2013 to write this review, and it feels as smooth as the customized version of Office 2010 I regularly use.

NPR: Review: Microsoft Office Pricey, But Good Value

The many long-awaited innovations include the official presentation of the new i'm Droid 2 operating system: the customized Android version developed by i'm Watch engineers.

ENGADGET: Updated Android-based I'm Watch, new I'm Here GPS tracker make their debut

They also pay WePay development fees for creating a customized version of the product.

FORBES: WePay Launches GroupOn Competitor

Apple obviously writes its own software for the iPhone, but Samsung's phones all run a customized version of Google's open-source Android, and Samsung is so dominant that it could very well split off and start building its own version of Android, just as Amazon did with the Kindle Fire.

CNN: Tech trends for 2013: Five things to watch

Eighty percent of the designers showing at Lincoln Center this month are managing their shows with a (free of charge) customized version called Fashion GPS for Mercedes-Benz Fashion Week.

FORBES: Mercedes-Benz Fashion Week Gets Technical

At least one system, Tennessee, plans a version of an experiment cropping up at schools around the country: having students take in-person and customized MOOC-like versions of the same course, and comparing results.

WSJ: Higher ed systems in 10 states turn to Coursera