Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Beyond Compare - Beyond Compare allows you to compare files and folders.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Wondershare PDFelement - All-in-one PDF editor
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.