MaxCapture is a software to make custom screenshots (whole desktop, only one window with a mouse pointing etc ..). It also allows to apply quite a number of filter combinations (red, green, blue, negative etc. ..) after capture 😉
GiantPaper
GiantPaper is a software to change the screen regular intervals on Windows background. At the time when I had installed Windows XP, no free software allowed to do this, I have been so desire to do for my boost ^^ my office.