When GitForce starts, it tries to detect diff and merge utilities for its use. It is recommended to have one of these installed before running the application.
You can always set a diff and merge tools later from within the Settings menu.
These are a few common diff and merge utilities that GitForce inherently knows about:
Perforce Merge Tool https://www.perforce.com/products/helix-core-apps/merge-diff-tool-p4merge
WinMerge https://winmerge.org
Beyond Compare 3 or 4 http://www.scootersoftware.com
KDiff3 http://kdiff3.sourceforge.net
KDiff3 http://kdiff3.sourceforge.net
TKDiff https://sourceforge.net/projects/tkdiff
Meld http://meld.sourceforge.net/index.html
Xxdiff http://furius.ca/xxdiff
Diffuse https://sourceforge.net/projects/diffuse
On a Linux OS, installing some of these utilities is as simple as typing “sudo apt-get install <name>” where <name> is a specific diff or merge utility.