1.graphsharp
Graph# is a graph layout framework.
It contains some layout algorithms and a GraphLayout control for WPF applications.
https://graphsharp.codeplex.com/
2.QuickGraph
QuickGraph 3.6: Generic Graph Data Structures and Algorithms for .NET.
QuickGraph provides generic directed/undirected graph datastructures and algorithms for .NET. QuickGraph comes with algorithms such as depth first seach, breath first search, A* search, shortest path, k-shortest path, maximum flow, minimum spanning tree, least common ancestors, etc... QuickGraph supports MSAGL, GLEE, andGraphviz to render the graphs, serialization to GraphML, etc...
http://quickgraph.codeplex.com/
3.Viasfora
Enrich your text editing experience with Rainbow Braces and more!
https://visualstudiogallery.msdn.microsoft.com/19609469-380e-4fcf-bcde-e31caeb658b2