Easy Block Diagram Creator using YAML and GraphViz
...These files are translated into the DOT language used by GraphViz. GraphViz is then called to produce a block diagram in any format GraphViz supports, such as PNG, JPEG, SVG, or PDF.
A Windows Graphical User Interface for XPdf and PdfToHtml Tools. An easy way to convert PDF files in simple text, jpeg, html and or extract images. It use xpdf (http://www.foolabs.com/xpdf/home.html) and pdftohtml