AddFlow for Winforms 2015 Main Features:

General

• Drawings can be made interactively or programmatically
• Distinct shapes, styles, colors, font can be defined on a per item basis (for a node or a link or a caption) or as default properties for the control
• Support of several collections allowing you to traverse the graph in many ways
• Many properties allowing customizing the control or an item
• Interactivity and display facilities
• Multi selection
• Multi-level Undo/Redo (with possible customization)
• the property bag allowing to easily add new properties to nodes and links
• Grid support
• Nodes stay connected when moved or resized
• Zooming
• Panning
• Scrolling, drag scrolling
• OwnerDraw property to provide custom drawing for an item or for the entire AddFlow control
• Labels

Input/Output

• The demo demonstrates printing, print previewing, and XML serialization. The C# source code of the demo is provided.
• Metafile exportation

Nodes

• Predefined shapes
• Custom shapes
• Ability to associate an image to a node
• Fill color, draw color, text color, gradient color
• Shadow
• In-place edition
• Text positioning options
• Image positioning options
• Tooltip
• Pins (for receiving links)

Links

• Predefined arrow styles
• Custom arrow styles
• Draw color, text color.
• Shadow
• Stretchable links. A link can be composed of many segments. The user can interactively add or remove segments
• Curved links (Bezier and Spline)
• Bentley-Ottmann algorithm to quickly find the link intersections 
• Reflexive links
• Possibility to interactively change the origin node or the destination node of a link
• Tooltip

Automatic Graph Layout (Professional version only)
AddFlow provides a set of several graph layout algorithms:

• Hierarchic layout
• Orthogonal layout
• Symmetric layout
• Series Parallel layout
• Tree layout
• Radial Layout

Each of these graph layout algorithms performs a layout on a graph. Performing a layout automatically positions its nodes (also called vertices) and links (also called edges).