Picasa

The website which you can be accessed is: www.picasa.com

Picassa it's a tool google used to edit photos and videos. Sort photos.This  program 
retouch photos. 


How to register: account required g-mail and download the program or
picasaweb.com can see photos of other people and comment on them.


Disadvantages:
- It's a simple program
- It Can't return to the original photos once they've saved.

Advantages:
- It's easy to use and it's free
- You can upload photos directly on youtube or google images.

Alternatives: 
1. Gimp
2. Photoshop 3. Photoscape
4. Flik