This is a list of some of the free diagraming applications that can be found in the market:   Google Docs Draw Free. Commercial. Web-based. https://docs.google.com/drawings/   Dia Diagram Editor Free. Open Source. Desktop application. https://sourceforge.net/projects/dia-installer/   LibreOffice Draw Free. Open source. Desktop Application. https://www.libreoffice.org/discover/draw/   yEd  Freeware. Propietary. Java-based Desktop Application. https://www.yworks.com/yed