
It is free for private and commercial use. Nomacs is licensed under the GNU General Public License v3 and available for Windows, Linux, FreeBSD, Mac, and OS/2. With this feature you can easily compare images by zooming and/or panning at the exactly same position or even by overlaying them with different opacity. A unique feature of nomacs is the synchronization of multiple instances. It has a pseudo color function which allows creating false color images. Nomacs includes image manipulation methods for adjusting brightness, contrast, saturation, hue, gamma, exposure. Activating the cache allows for instantly switching between images. Within a directory you can apply a file filter, so that only images are displayed whose filenames have a certain string or match a regular expression. A thumbnail preview of the current folder is included as well as a file explorer panel which allows switching between folders. Metadata stored with the image can be displayed and you can add notes to images. It is able to browse images in zip or MS Office files which can be extracted to a directory. Nomacs features semi-transparent widgets that display additional information such as thumbnails, metadata or histogram. You can use it for viewing all common image formats including RAW and psd images.

And Picasa makes it a snap to share your pictures, you can email, print photos home, make gift CDs, instantly share via Hello, and even post pictures on your own blog. Picasa also makes advanced editing simple by putting one-click fixes and powerful effects at your fingertips. Picasa makes sure your pictures are always organized.

You can drag and drop to arrange your albums and make labels to create new groups. Every time you open Picasa, it automatically locates all your pictures (even ones you forgot you had) and sorts them into visual albums organized by date with folder names you will recognize. Picasa is software that helps you instantly find, edit and share all the pictures on your PC. Note: Picasa is now retired, but it should continue to work anywhere it's installed.
