GraphThing - GraphThing is a tool that allows you to create, manipulate and study graphs.
SocNetV - Social Network Visualizer (SocNetV) is a cross-platform, user-friendly free software application for social network analysis and...
jsflap - A web-based NFA and DFA construction and testing tool.
Graphynx - Create weighted and unweighted graphs and run algorithms step by step.
Graphviz - Graphviz is open source graph visualization software. It has several main graph layout programs.
Gephi - Gephi is an open-source software for visualizing and analyzing large networks graphs.