The best open source alternative to Adobe Acrobat DC is Scribus. If that doesn't suit you, our users have ranked more than 100 alternatives to Adobe Acrobat DC and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Adobe Acrobat DC are PDFTK Builder, GImageReader, PDF Arranger and Paperwork.
Adobe Acrobat DC is mainly a PDF Editor but alternatives to it may also be PDF Readers or Desktop Publishers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Adobe Acrobat DC.
Scribus is a desktop publishing (DTP) application. Scribus is designed for flexible layout and typesetting, and the ability to prepare files for professional quality image setting equipment. It can also create animated and interactive PDF presentations and forms.
Scribus vs Adobe Acrobat DC opinions
pros, cons and recent comments
coth Scribus cannot edit PDF files. You can only export into PDF. But you cannot open or import PDF.
PDFTK Builder is a free graphical interface to for PDFtk, making it much easier to use. It is a easy to use tool to collate (merge), split, encrypt, decrypt, stamp and rotate (only 90°, 180° or 270°) pdf documents.
Almost everyone thinks PDFTK Builder is a great alternative to Adobe Acrobat DC.