Top 20 NuGet expression Packages

Interfaces and base implementation for the Specification pattern.
This library wraps the common request properties for a search/get request from any HTTP client
Helper methods for lambda expressions
Trivial Ast
With this library you can evaluate math expressions fast and easily. Expression will be compiled into native code, also you can dynamicly change variables.
Common extensions for entities for every project using Entity Framework
Generic Repository implementation for Entity Framework.
Package provides integration between Generic Repository and Query Mappings for Entity Framework
NJection.LambdaConverter is a .NET library for converting delegates resolved from methods/constructors to expression trees.
Performs fast, deep or shallow clone using simple assignment operations generated by Expression Tree runtime code compilation.
Utils for .NET applications + Serializers for object to JSON and XML + Object Binder for NameValueCollection to Object + Safe converter for any object type to another object type + Regular Expression patterns for many string format + Extension methods for some actions + Hash utils for crypto + File...
A parser that uses the Reverse Polish Notation and the Shunting-Yard algorithm to transform a simple mathematical expression into a computed numerical value. Useful for simple calculator projects.
Dynamic Creation of Expression from String, calculation symbolically derivative, partial differentiation, simplifying math expressions
IdeaStudio Core : helpers, method extensions, converters, ...
RPN Expression Parser and Evaluator with databinding to POCO and INPC instances.
DataBag provides an easy way of resolving string expressions based on registered variables. For more details see Project Site.
Syntax expression parser/evaluation. Manage null values.
C# Wrapper that helps calculate mathematical expressions that include a variable(x).
Micosoft Expression Blend SDK for 4.5
A convention object to object or DataReader to object mapper in .NET.