Irfanview is a free image editor for personal use (and can be purchased for a small donation for commercial use) that is quite simple to use and pretty powerful for many image modifications.
One of the things I find it really useful for is when I am looking through a lot of pictures that I have in a folder. It is often easier to use than Photoshop or Bridge for this purpose.
Once you install Irfanview all you have to do is open a photo using it.
Use the “-” key to zoom out or SHIFT “+” to zoom in until you find a viewing size that works with your monitor. Once you do you can ‘lock’ the view by clicking on: “View > Lock Zoom (Only if “Fit to image”)”.
Now all you have to do to move through the pictures in the directory that the photo is in is to use your SPACE button to move forward and your BACKSPACE button to move backwards. They will all be the same zoom level.
This is a very fast way to skim through a bunch of photos and find the ones you want to use.
You can also set up Irfanview so that it has an external file editor. I set this to be Photoshop (“Options > Properties > Misc. 2 > Set external viewer / editor” from the Irfanview file menu).
Once you do this when you find a photo you want to modify just click “File > Open with external editor” and Photoshop will launch with the picture ready for editing.
BTW, Irfanview can also view files in RAW format.
Just thought you might like this tip for looking through batches of files.