LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Worknice - Worknice is a performance management software that helps companies effectively manage their sales and customer-related business processes.
draw.io - Online diagramming application
Sympa - Sympa is an open source (GNU GPL) mailing list management (MLM) software.
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.
DreamTeam - Effectively manage all of your projects with DreamTeam, a comprehensive project management platform.