PDF-XChange Viewer promises to be a smaller, faster and more feature-rich PDF reader alternative to Adobe Reader. This PDF utility is being replaced by PDF-XChange Editor but will remain available for download with no further updates being released.
PDF-XChange Viewer can OCR your image based or scanned PDF's to make fully text searchable PDF files, add comments and annotations, and even add & apply custom stamps. It comes with measurement tools including perimeter and area, and Markup pages with text and objects. It also lets you type directly on any PDF page; not just Adobe enabled forms documents in typewriter mode.
PDF-XChange Viewer can export PDF pages or entire files to any one of the supported image formats including BMP, JPEG, TIFF, PNG and more.