Celonis - Celonis offers process mining tool for analyzing & visualizing business processes.
draw.io - Online diagramming application
QPR ProcessAnalyzer - QPR ProcessAnalyzer extracts and reads the timestamps used to record specific events along procurement and/or supply chains.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Software AG webMethods - Software AG’s webMethods enables you to quickly integrate systems, partners, data, devices and SaaS applications
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.