|  | `araxis`;;           Use Araxis Merge (requires a graphical session) | 
|  | `bc`;;               Use Beyond Compare (requires a graphical session) | 
|  | `bc3`;;              Use Beyond Compare (requires a graphical session) | 
|  | `bc4`;;              Use Beyond Compare (requires a graphical session) | 
|  | `codecompare`;;      Use Code Compare (requires a graphical session) | 
|  | `deltawalker`;;      Use DeltaWalker (requires a graphical session) | 
|  | `diffmerge`;;        Use DiffMerge (requires a graphical session) | 
|  | `diffuse`;;          Use Diffuse (requires a graphical session) | 
|  | `ecmerge`;;          Use ECMerge (requires a graphical session) | 
|  | `emerge`;;           Use Emacs' Emerge | 
|  | `examdiff`;;         Use ExamDiff Pro (requires a graphical session) | 
|  | `guiffy`;;           Use Guiffy's Diff Tool (requires a graphical session) | 
|  | `gvimdiff`;;         Use gVim (requires a graphical session) with a custom layout (see `git help mergetool`'s `BACKEND SPECIFIC HINTS` section) | 
|  | `gvimdiff1`;;        Use gVim (requires a graphical session) with a 2 panes layout (LOCAL and REMOTE) | 
|  | `gvimdiff2`;;        Use gVim (requires a graphical session) with a 3 panes layout (LOCAL, MERGED and REMOTE) | 
|  | `gvimdiff3`;;        Use gVim (requires a graphical session) where only the MERGED file is shown | 
|  | `kdiff3`;;           Use KDiff3 (requires a graphical session) | 
|  | `meld`;;             Use Meld (requires a graphical session) with optional `auto merge` (see `git help mergetool`'s `CONFIGURATION` section) | 
|  | `nvimdiff`;;         Use Neovim with a custom layout (see `git help mergetool`'s `BACKEND SPECIFIC HINTS` section) | 
|  | `nvimdiff1`;;        Use Neovim with a 2 panes layout (LOCAL and REMOTE) | 
|  | `nvimdiff2`;;        Use Neovim with a 3 panes layout (LOCAL, MERGED and REMOTE) | 
|  | `nvimdiff3`;;        Use Neovim where only the MERGED file is shown | 
|  | `opendiff`;;         Use FileMerge (requires a graphical session) | 
|  | `p4merge`;;          Use HelixCore P4Merge (requires a graphical session) | 
|  | `smerge`;;           Use Sublime Merge (requires a graphical session) | 
|  | `tkdiff`;;           Use TkDiff (requires a graphical session) | 
|  | `tortoisemerge`;;    Use TortoiseMerge (requires a graphical session) | 
|  | `vimdiff`;;          Use Vim with a custom layout (see `git help mergetool`'s `BACKEND SPECIFIC HINTS` section) | 
|  | `vimdiff1`;;         Use Vim with a 2 panes layout (LOCAL and REMOTE) | 
|  | `vimdiff2`;;         Use Vim with a 3 panes layout (LOCAL, MERGED and REMOTE) | 
|  | `vimdiff3`;;         Use Vim where only the MERGED file is shown | 
|  | `vscode`;;           Use Visual Studio Code (requires a graphical session) | 
|  | `winmerge`;;         Use WinMerge (requires a graphical session) | 
|  | `xxdiff`;;           Use xxdiff (requires a graphical session) |