Picasa is Google's image organizer and image viewer for organizing and editing digital photos, which share directly to Google+ and offers a rich selection of editing tools.
Picasa was originally created by a company named Lifescape (which at that time may have resided at Idealab) in 2002 and owned by Google since 2004. "Picasa" is a blend of the name of Spanish painter Pablo Picasso, the phrase mi casa (Spanish for "my house") and "pic" for pictures (personalized art).
In July 2004, Google acquired Picasa from its original author and began offering it as freeware.
Native applications for Windows XP, Windows Vista, Windows 7 and Mac OS X (Intel only) are available through Google Labs.