PDF Studio, a full-featured PDF editor positioned as an alternative to the more expensive Adobe Acrobat, has upgraded to v6.5 -- a significant update that adds several new features and offers improvements in every area. The most significant changes include a new batch dialog to manage, open and view several documents at once on startup, a new callout annotation tool, a calibration tool to supplement the existing measuring tool which will allow users to set scale directly from a drawing, and dragging and dropping pages across documents, among others.
