From Adobe Systems:
The Lightroom 5 beta offers a free, public preview of new features and tools that will be offered in the final release, expected later this year.
Adobe Lightroom is the efficient new way for professional photographers to import, select, develop, and showcase large volumes of digital images. So you can spend less time sorting and refining photographs, and more time actually shooting them. Its clean, elegant interface literally steps out of the way and lets you quickly view and work with the images you shot today, as well as the thousands of images that you will shoot over the course of your career. Because no two photographers work alike, Adobe Lightroom adapts to your workflow, not the other way around.