Zoner Photo Studio Free is an attractive, easy-to-use image organiser with various photo editing and sharing features.
The thumbnail browser is straightforward and you'll immediately feel at home with it. The program is quick, and responsive, too - you're not kept waiting while it creates thumbnails. And if there are too many images in a particular folder, than an extensive Filter dialog will help you zoom in on the pictures you need. It's possible to filter by file name, date, time, file size, title, author and description, rating, latitude and longitude for geotagged images, and any other photo metadata you might use.
Editing options include the ability to crop, rotate or resize your photo and apply various white balance, apply various 1-click filters, or go more in-depth with a host of white balance, exposure, colour and sharpness tweaks. Anything evenly faintly advanced is reserved for the commercial version (selections, masks, tone mapping, HDR), but you'll be able to handle most basic tasks in a click or two.
And once your favourite images are polished to perfection, the program can then help you share them on Facebook, Twitter, by email and more.