Here is a list of FREE software that may come in handy as a photographer or just to play with for something different. I will add more as I discover things which amaze me.
An easy way to add Drama to a cloudy Sky using layers.
Photo Frames MOCKUP using "Smart Objects"
Open Book MOCKUP using "Smart Objects"
Business Card MOCKUP using "Smart Objects"
Out of Frame TUTORIAL
Flash Exposure Calculator by Bob Young.