I don’t know of any such software, however I have gone out and snapped photos of things such as concret, brick and trees to provide myself with textures. Also there are hundreds, if not thousands, of web sites that offer free textures for the downloading. For great bricks, try ACME brick - they have or had a catalog that you could download and refer to with nice sized thumbnails of their product line.
I bought Photoshop, but one can also use the GIMP. Photoshop brushes work great in the GIMP and you can sometimes follow along with a PS tutorial in the GIMP.
So, there are a lot of resources for next to no cost out there.