And there is PrintMe Mobile from EFI, which come as software installable on Windows or Linux servers.

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Installable images and source code will be available from developer.ubuntu.com.

ENGADGET: Ubuntu for tablets revealed with split screen multi-tasking, preview for Nexus slates coming this week

Unless the elimination of used games comes with steep discounts on new, downloadable, installable titles, this is going to be very bad for consumers, and subsequently very bad for Microsoft.

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Although it has integrated the product into its Outlook.com web email service, it will continue to offer Skype as a separate installable application on its new system, avoiding the risk of anti-competition complaints.

BBC: Skype slashes battery use for Windows 8 system launch

It is also installable on web browsers.

BBC: Java still contains security flaws, experts claim

Google's App Verification Service is a quiet addition to Android 4.2, but potentially game-changing: it promises malware checks for any installable Android app, whether it comes from a Bouncer-verified Google Play or a website lurking in the shadows.

ENGADGET: Android 4.2 App Verification Service tested, found no substitute for full anti-malware tools

Music lovers can access MOG's entire catalog of over 11 million songs, nearly everything you'd find in popular music download stores, for free, making it the easiest way to enjoy instant access to music with no installable client application and no credit card needed.

ENGADGET: MOG FreePlay brings 11 million songs to the web gratis, makes you work for free tunes