Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
IBM Journey Designer - IBM Journey Designer is an advanced-level tool now provided by Acoustic that is used to improve the journey of the customers and provides you with the suggestion to minimize the bottleneck situations in a customer’s journey.
draw.io - Online diagramming application
InMoment - Experience Management
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
SuiteCX - Customer Experience Mapping Solutions