I searched for a tool that compares two text files.
Maybe usefull for others too.
customizable color highlighting of differences
drag and drop enabled
accepts commandline parameters for file and folder comparisons
double click modified (green) files to view file differences
a very fast compare algorithm
blank characters and case can be ignored during a compare operation
easy navigation between differences
easy two-way merging
in-place text editing
search and replace text
multiple undo/redo of text changes
generates a report of file differences
Freeware with full source code
Looks portable to me, but i´m not sure.