kdiff3
Beyond Compare
WinMerge
Meld
Araxis Merge
DiffMerge
P4Merge
Devart Code Compare
Papers
Mendeley
Qiqqa
JabRef
Docear
BibDesk
Zotero
Citavi
kdiff3Beyond Compare - Beyond Compare allows you to compare files and folders.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
JabRef - Graphical Java application for managing bibtex (. bib) databases.โJabRef ยทย โJabRef Help ยทย โJabRef | Blog ยทย โOpenOffice/LibreOffice .