Camscanner is a scanning software for your android and iOS devices. This application have more than 60 million installations. To celebrate that they are giving away the Pro version of CamScanner.
Access Documents from the Web
Quickly Scan Document
Optimize Scan Quality
Easy Search Document
Advanced Document Editing
Intelligent Document Management
The free version is ad. supported and have watermark, while the Pro version id Ad-Free, No watermark and also have unlimited annotations.
Get it for free from here