From Iceni Technology:
Infix PDF Editor edits text like a word processor using rulers, tabs, search and replace and spell checking. Infix is the only PDF editor that intelligently re-creates the original content so that you can edit it in the way you would expect. Most PDFs just contain fragments of text – just a few words at a time. Other PDF editors allow you to edit each fragment individually. Infix is the product of more than a decade’s work and development in the professional print industry.
It uses a set of intelligent algorithms to recreate the original structure of the document. This means you can edit a PDF just like you would a Word document. Use Infix to edit text across columns and pages. Manipulate graphics, images, and pages. Edit PDF documents made by any software. Reuse your existing documents. Infix removes the need to convert your PDFs into other formats by enabling you to edit them directly.