Also, you cannot say that it is available for free to use but, with almost every Windows-based computer system that you will buy from the market. So, Microsoft Word is one of the best PDF editing programs that are available for the Windows operating system. 1# A Microsoft Word – Open Source PDF Editor You can also review from various sources. Then the list is created and based on user ratings. Also, I have researched that this will also be made a list of some free, open-source PDF editors. However, most of the PDF editor programs are also available online. 1.9 #9 The PDFedit Open Source PDF Editor:Ī-List of Open Source PDF Editors for Windows and Mac:.1.3 #3 The Inkscape – Open Source PDF Editor.1.2 #2 To Formulate Pro – Best Open Source PDF Editor for Mac.1.1 1# A Microsoft Word – Open Source PDF Editor.1 A-List of Open Source PDF Editors for Windows and Mac:.