Top 20 NuGet behavior Packages

With Interaction Lib you can wire up most common ajax UI interactions with as few as 2 - 3 attributes right in your markup with no additional javascript. Also provides markup for wiring and configuring other jQuery/jQueryUI plugins. Provides support for unobtrusive configurations.
A startup sample for Caliburn.Micro using Windsor
XperiAndri.Expression.Interactions is a port of Microsoft.Expression.Interactions to the Windows Runtime
This is my useful Windows Runtime library
Framework built on top of xUnit to allow writing inheritance based BDD style tests.
Dagmatic Akka
Extensions for the Proxii library to easily hook into NLog
GladBehavior.Tree is a C#/.NET Behavior Tree (BT) implementation that supports generic contexts/agents.
.Net Standard 2.0 version of corcav.behaviors
A simple and easy way to write behavior driven tests.
Generic WPF extension library. For example, one line binds commands to all events.
Cross platform library containing a bunch of XAML behaviors for Xamarin Forms.
Behaviors for Blazor. Extract functionality from a Component into a Behavior to make it reusable. Reuse it by adding Behaviors to a Component.
Useful behaviors for XF Material field validation
A collection of universally useful XAML value converters, behaviors, and styles.
A bridge package allowing smooth transition from LightBDD to LightBDD.NUnit2. After update to this version, the LightBDD package can be removed and LightBDD.NUnit2 should be used since then.
A bridge package allowing smooth transition from LightBDD.NUnit to LightBDD.NUnit2. After update to this version, the LightBDD.NUnit package can be removed and LightBDD.NUnit2 should be used since then.
The magic-free Caliburn.Light, a powerful framework designed for building applications across current XAML platforms.
Behavior Driven Development (BDD) wrapper for .NET MsTests
Defines behaviors through (attached) dependency properties. Current version: Drag property, with (optional) location restore across sessions