SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
draw.io - Online diagramming application
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
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.