Using Meld from Cygwin
To use Meld from Cygwin:
Download and install Meld for Windows. If you get “missing MSVCP100.dll”, install Microsoft Visual C++ 2010 redistributable package
Add to Cygwin ~/.bash_profile
alias meld="/cygdrive/c/Program\ Files\ \(x86\)/Meld/Meld.exe"
Open a new Cygwin terminal to use Meld from Cygwin.
Usage
Many use Meld for git mergetool. For Cygwin:
git config --global diff.tool meld
git config --global merge.tool meld
git config --global mergetool.meld.path "/cygdrive/c/Program Files (x86)/Meld/Meld.exe"