Free; Simple and intuitive interface; Efficient photo organizing and tagging, with excellent face recognition; Easy uploading to Google+ and Blogger; Quick edits, with one-click special-effect filters and basic image correction sliders. All edits are global, with no ability to alter portions of your picture; Sharing shortcuts only for Google+ and Blogger; Limited Help; Few photo projects. Picasa is free; that alone is an incentive to download the program. But many people will choose to stay with Picasa because it gives almost immediate gratification with little or no fuss. All edits are easy, using simple, intuitive controls. With Picasa (available for Windows and Mac), it takes very little time to get photos from your camera organized and sorted on your computer, tweaked and ready for sharing.
Picasa's interface is fairly easy to use, and its commands are straightforward. Picasa opens into the Library view, as do most other image-editing programs. However, unlike rivals such as PaintShop Pro, Photoshop Elements or Lightroom (all paid apps), Picasa doesn't use a tabbed interface for navigating between the Library and photo-editing window. Instead, you double-click any thumbnail image in Library to open up an Edit window. You can download latest setup of picasa from below provided links.