What are some alternatives?
When comparing Flowchart.com and yEd Graph Editor, you can also consider the following products
Unifosys OrgDoc - OrgDoc is a unique desktop-based Organization Chart Creator & Data Organizer software.
draw.io - Online diagramming application
OrgWeaver - OrgWeaver is a cloud-based organizational chart software.
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.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.