In some situations the ability to edit PDF documents is required, especially when you don't have the source file from which the PDF document was created. We have gathered here some of the best freeware to edit your PDF files.
Acrobat Acrobat Reader
Adobe Acrobat Reader is a software that allows you to print, view and annotate PDF documents. You can open PDF files and modify their content: diagrams, spreadsheets, videos, emails and more. The latest version of the software allows you to add comments to a PDF document and share this comment with other potential users. Guest users have access to several tools: take note, highlight text (for comments), add signatures...
LibreOffice is a complete office suite with the following softwares: vector graphics, word processing, spreadsheets, mathematical formulas, etc... Once your file is saved in the correct format, you can open it with any LibreOffice application. You will have access drawing tools, text, printing, and many more.
This software suite is based on the OpenOffice.org suite.
Foxit Reader allows you to add comments or notes to your PDF files.
As with Adobe Acrobat Reader, you have several tools at your disposal: underline, highlight, insert comments, notes,...
Foxit Reader also allows you to add media like videos, photos and links to your PDF documents.
InkScape is a vector drawing software (freehand, CAD). InkScape allows you to save your project in the following formats: CSS, XML, or SVG. It is also possible to create web pages. The software can import images to EPS, JPEG, PostScript, PNG and TIFF.
InkScape also allows you to modify other type of files.