The following haven't been tested mostly because I can't figure out how to do so.

diff --minimal

diff --horizon-lines

diff --speed-large-files

diff --show-c-function

diff --show-function-line

diff --starting-file

diff -x | -X in combination with --ignore-file-name-case as the latter doesn't work due to a bug.

diff3 -a 

diff3 -T