Windows: When you're whipping together a presentation in a hurry, don't spend hours poring over fonts to find exactly the right one. Free app WinFontsView displays all the fonts on your system so you can quickly grab one you need.
To find fonts on your system, simply run the portable EXE file from a thumb drive or wherever it's stored on your hard drive. The app displays a handful of samples for each font, including bold, italic, underline, and different sizes options, too. You'll be able to tell at a glance which fonts might work for your needs and which you can skip right off the bat.
WinFontsView isn't as full-featured as some of the other font managers out there, but it's perfect for previewing batches of fonts so you don't have to painstakingly click on every single one you want to test. It also won't change the font in blocks of text you've already typed so it won't help you compare how your work will look in different typeface. You'll want something like previously mentioned Windows Fonts Explorer for that.
WinFontsView is available in several languages and works with all Windows version 2000 and higher.