draw.io - Online diagramming application
UCINET - UCINET for Windows is a software package for the analysis of social network data.
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.
Pajek - Pajek is a lightweight solution developed from scratch by an extraordinary team of developers for the purpose of Large Network Analysis.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
SocNetV - Social Network Visualizer (SocNetV) is a cross-platform, user-friendly free software application for social network analysis and...