Another arrow in your image-editing quiver

I've extolled the virtues of Irfanview for photo editing several times, and use it regularly myself. But it does have real limitations, particularly in its colour-correcting abilities. So I was pleased to come across what we might call a companion program, Fotografix, which makes up for much of what Irfanview lacks. The first big virtue of Fotografix is that it is tiny, and it runs without needing to be installed, so you can carry it on a memory stick. Although it's a no-frills program, it has many of the functions of PhotoShop, such as brush shapes, layers and masking. Its interface is pretty basic, but used in conjunction with Irfanview, I would say the pair would do 90 percent of your normal imaging tasks, and at a very reasonably price (like, free).