Top 20 NuGet cross-platform Packages

Implements the Apmetrix SDK for C#/WinJS/C++ Store & Phone Apps
Model Validation for Universal Apps through delegate method invocation per-property or DataAnnotation styled attribute validation. Universal apps targeting Windows 8.1 and Windows Phone 8.1 lack built in, easy to use data Validation, so ValidatableBase was created.
The Cross-platform XAML Framework
A cross-platform msbuild/xbuild task for transforming T4 templates.
Lightweight framework for developing HTML5 hybrid cross-platform applications.
The Cross-platform XAML Framework
A cross-platform msbuild/xbuild task for transforming T4 templates. Depends on MSBuild 14.0
The Cross-platform XAML Framework
SubtitleParser Corss-Platform works on iOS, Android and Windows. and also Works with Xamarin.
Generic B-tree written in C#, which can be replaced with NoSQL database stored in the memory. The B-tree is a generalization of a binary search tree in that a node can have more than two children (Comer 1979, p. 123). Unlike self-balancing binary search trees, the B-tree is optimized for systems th...
Cross-platform file reader for windows Portable Executable file format.
Better, stricter ILGenerator.Emit
Parsing library for Mono DllMaps
Provides utilities class for .NET
SkiaSharp for Linux is a supporting package for Linux platforms.
LogFramework is a simple, cross-platform, and open source framework at the logging facade level of abstraction so application code can essentially be independent of any particular logging library/implementation.
Native library build for SkiaSharp on Alpine Linux.
A cross-platform CSV Writer for C#
Implementation of the MyLanguages.Core library to add WPF features.