The Collaborative Testing System (CTS) tests parallel software using various implementations of MPI. It works on multiple platforms and supports batch systems including LSF, LCRM and workstations without a batch system. It includes a numerical diff tool.
External diff Tool is an Eclipse plugin that allows the launch of an external diff tool for file compares rather than the default built-in Eclipse diff tool. This plugin doesn't replace the built-in Eclipse tool. It only adds a new menu item to the GUI.
A source code diff tool. Adapted from cvsweb, it makes code inspection easy. It also provides another diff tool with which you can either compare two files or two directories recursively. It is written in perl and uses String::Ediff for finer diff.
A cross-platform file diff and directory diff Tool. Also contains an SCM project which uses the stand-alone tool. Go to https://vmaster.sourceforge.net to see screenshots or to start the diff tool.
Tcldiff is a Tcl extension implementing a [diff] command for Tcl scripts. It implements the options of the OpenBSD diff tool and can compare files as well as directories.