The Official C# .NET Driver for MongoDB

Steamworks wrapper for Unity / C#

Open source recreation of Daggerfall in the Unity engine

Create cross-platform (Xamarin, Windows, ...) simple charts.

Xamarin and MvvMCross plugin for authenticate a user via fingerprint sensor

Deep Learning in C#

Read and Write Settings Plugin for Xamarin and Windows

Check and Request Permissions Plugin for Xamarin and Windows

Cross-platform socket API for Xamarin iOS/Android/Forms, Xamarin.Mac/MonoMac, Windows Phone 8/8.1, Windows Store and Windows Desktop.

Cross platform Xamarin & Windows plugins for PCLs

A server emulator for Lineage2 Interlude written in C#

Bright Wire is an open source machine learning library for .NET with GPU support (via CUDA)

A slideout navigation control for Xamarin.iOS

This is the home of nuget.core and all the repos from codeplex.

A cross platform settings plugin for Xamarin and Windows. Unlike other setting libraries in the wild, this library provides several unique features. Store almost any object, monitor change events, …

Xamarin.Forms side menu control (targeted at Android, iOS and Windows Phone)

Hybrasyl Server

Framework to develop and implement plugins in an application

NetStandard Storage Plugin for Xamarin and Windows

Simple logger for Xamarin.Forms applications.

An example of the Bait and Switch trick that I learned from Paul C Betts blog

Hybrasyl Launcher

Compatibility layer for System.Drawing in CoreCLR.

Facebook SDK for .NET