Thanks! I think I found the best one, recommended by a user on another BlackBerry forum. He writes:
"ScanWritr is really good. It is fast, page edge recognition is out of this world and overall this app works great on my Z10. I am so happy with this app that I decided to share this with you. In fact i was so happy with the free version (limit of 5 pages) that I bought full version. Scanned pages come out professionally looking with this app.
This is hands down the best scanner app in Blackberry store now."