SmartDraw - Instead of starting with a blank screen, SmartDraw gives you the exact template you need.
UCINET - UCINET for Windows is a software package for the analysis of social network data.
Creately - The new interface for work to ideate, plan, and execute
Gephi - Gephi is an open-source software for visualizing and analyzing large networks graphs.
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.
Pajek - Pajek is a lightweight solution developed from scratch by an extraordinary team of developers for the purpose of Large Network Analysis.