Google is ready to unveil a suite of software for mobile phones based on open-source technology, backed by some of the largest wireless industry companies in the world. The company is expected to hold a press conference on Monday to unveil the project, which is expected to incorporate software from the Linux world into a mobile platform code-named Android that's designed to run on phones, according to sources familiar with Google's plans. A software development kit for what's being called "a complete mobile-phone software stack" is believed to be in the works and will be released relatively soon thereafter, the sources said. It's not exactly clear what kind of software will come as part of that stack, but it's said to include everything you need to run a phone. Also, don't expect to see a Google phone, or Gphone, on store shelves anytime soon. And in such a large project with so many different players, plans and some details could still change over the weekend. It's unclear when the final version will be released. Google has repeatedly declined to talk about the Gphone or confirm the Monday event.