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2. PDFtk - Wikipedia

   en.wikipedia.org/wiki/Pdftk

   PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. [3] [4] It runs on Linux, Windows and macOS. [5] It comes in three versions: PDFtk Server (open-source command-line tool), PDFtk Free and PDFtk Pro (proprietary paid). [2] It is able to concatenate, shuffle, split and rotate PDF files.

3. GrafX2 - Wikipedia

   en.wikipedia.org/wiki/GrafX2

   The user can split the editing area in two : normal size on the left, zoomed-in view on the right. Drawing in the zoomed area allows finer mouse control. The basic drawing concepts are clearly inspired by Deluxe Paint, they involve : a brush : It's one of the built-in monochrome shape, or a piece of colored bitmap grabbed by the user.

4. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   an Office suite; allows to export (and import, with accuracy limitations) PDF files. Microsoft Word 2013: Proprietary: Desktop software. The 2013 edition of Office allows PDF files to be converted into a format that can be edited. Nitro PDF Reader: Trialware: Text highlighting, draw lines and measure distances in PDF files. Nitro PDF Pro ...

5. Technical drawing tool - Wikipedia

   en.wikipedia.org/wiki/Technical_drawing_tool

   Various scales and the protractor are used to measure the lengths of lines and angles, allowing accurate scale drawing to be carried out. The compass is used to draw arcs and circles. A drawing board was used to hold the drawing media in place; later boards included drafting machines that sped the layout of straight lines and angles.

6. Poppler (software) - Wikipedia

   en.wikipedia.org/wiki/Poppler_(software)

   poppler-utils is a collection of command-line utilities built on Poppler's library API, to manage PDF and extract contents: pdfattach – add a new embedded file (attachment) to an existing PDF; pdfdetach – extract embedded documents from a PDF; pdffonts – lists the fonts used in a PDF

7. Perspective (graphical) - Wikipedia

   en.wikipedia.org/wiki/Perspective_(graphical)

   Linear or point-projection perspective works by putting an imaginary flat plane that is close to an object under observation and directly facing an observer's eyes (i.e., the observer is on a normal, or perpendicular line to the plane). Then draw straight lines from every point in the object to the observer.