Top 20 NuGet unity3d Packages

Genesis is a general-purpose, plugin-extensible code generation framework for Unity. This package enables a developer to write a code-generation plugin for v2 Genesis.
Dream-Remoting is a networking solution primarily geared towards game development
Package Description
EntityNetwork for Unity3D
GladNet3's (Glader's Library for Advanced Development of Network Emulation Technologies) serializer API library. Install this package if you need to implement adapters for the serializer to be used in the GladNet3 networking.
GladNet3's (Glader's Library for Advanced Development of Network Emulation Technologies) handler API. Install this if you want to create message handlers that can handle GladNet3 messages.
The probably fastest way to use custom contracts in Photon
A set of utility classes and components useful to any Unity project.
Glarduino is an asynchronous communication library for .NET/C# Serial Ports and Arduino.
The package of Cascade library. It allows to convert text description to C# object and get data in hierarchical tree format.
Adds project assembly references to Unity3D managed DLLs installed on the system. Adds Package Manager Console commands to update, add, and remove Unity3D assembly references.
Unity3D tasks for FAKE
Uniful is a collection of useful Unity3D Types and Components.
A System.Text.RegularExpressions implementation for Unity3d that supports compiled regexes
Hazel Networking is a low-level networking library for C# providing connection orientated, message based communication via TCP, UDP and RUDP.
A command pattern implementation where commands can be chained to create macro command.
Forked Newtonsoft.Json to support Unity3D