YATE Yet Another Telephony Engine: Private Branch Exchange, Softswitch, GNU General Public License, OpenH323, Open Source Software, Unified Communications

XMIND: Open Source, Mind Maps, FreeMind, Eclipse Public License, GNU Lesser General License

Asterisk (PBX): Software, Mark Spencer (computer engineer), GNU General Public License

Aeolus (Software): GNU General Public License, Freie Software, Pfeifenorgel, Rechenmodell, Werckmeister Stimmung, JACK

QtiPlot: Computer Program, Origin, SigmaPlot, OpenGL, GNU General Public License, Free Software