Flickr is a free photo managing and sharing Web application aimed at providing users a way to organize and share personal photos with others. Since Flickr is an online application, you are able to use Flickr on any Web browser and can login using an existing Yahoo, Google, or Facebook account. 

 Flickr's Creative Commons feature grants users the option of securing copy-free images. 

Flickr Resources

Pixlr is a free online photo editor using a Flash platform. You can test Flash here and if you cannot see the Flash file, download the Flash Plugin here. Pixlr is targeted towards those requiring photo editing needs for quick online editing and is also a convenient tool when uploading to sites for social networking purposes (Google+, Facebook, Twitter, Flickr, and Photobucket). Currently, you do not need to have an existing external account to use Pixlr.   

Pixlr Resources

Picasa is a free photo organizing and editing software program from Google. It's compatible on Windows, Mac, and Linux operating systems. Watch the video below to get an introduction to Picasa 3.