The GNU Octave interval package is build upon great third-party software.

Several unit tests are derived from libieeep1788, developed by:
    Marco Nehmeier <nehmeier@informatik.uni-wuerzburg.de>
    Chair of Software Engineering
    Department of Computer Science
    University of Würzburg
    Germany
    http://se.informatik.uni-wuerzburg.de/
    https://github.com/nehmeier/libieeep1788

A linear system solver is derived from a routine developed for C-XSC by:
    Martin Zimmer
    Chair of Scientific computing
    University of Wuppertal
    Germany
    http://www2.math.uni-wuppertal.de/~xsc/

Correctly rounded arithmetic operations are based on the GNU MPFR library by:
    Guillaume Hanrot,
    Vincent Lefèvre,
    Patrick Pélissier,
    Philippe Théveny and
    Paul Zimmermann
    http://www.mpfr.org/

An OCT-file interface for setting the rounding mode, developed by:
    Kai Torben Ohlus
    Institute for Reliable Computing
    Hamburg University of Technology
    Germany
    http://kontakt.tuhh.de/de/suchergebnis.php?id=ti3kto
