Windows: Normally $US40, Glary Utilities Pro - a system utilities suite - is available for free, today only.
We've highlighted the free version of Glary Utilities before, today you've got a chance to grab the professional edition for free. Although you can certainly get all the functionality found in Glary Utilities Pro by using a collection of open-source or freeware tools for the cool price of free you might as well save yourself the running around and grab a copy of the Pro edition which includes features like an uninstall manager, registry repair, a startup manager, secure file deletion, disk analysis and a duplicate finder, as well as process manager.
Have a good system utility to share free temporarily or otherwise? Let's hear about it in the comments. Glary Utilities Pro is Windows only and free until the end of the day at the link below.