Flickr
Flickr (pronounced pronunciation ) is an American image hosting and video hosting service, as well as an online community. It was created by Ludicorp in 2004 and is a popular way for amateur and professional photographers to host high-resolution photos.
Picasa
Picasa is a discontinued, cross-platform image organizer and image viewer for organizing and editing digital photos, integrated with a now defunct photo-sharing website, originally created by a company named Lifescape (which at that time was incubated by Idealab) in 2002. is a blend of the name of Spanish painter Pablo Picasso, the phrase mi casa (Spanish for ) and for pictures.Native applications for Windows XP, Windows Vista, Windows 7, and Mac OS X (Intel only) were available, and for Linux, the Windows version was bundled with Wine.