There are 2 repositories under netstandard topic.
NLog - Advanced and Structured Logging for Various .NET Platforms
An addictive .NET IoC container
A cross-platform plotting library for .NET
OSharp是一个基于.NetCore的快速开发框架，框架对 AspNetCore 的配置、依赖注入、日志、缓存、实体框架、Mvc(WebApi)、身份认证、功能权限、数据权限等模块进行更高一级的自动化封装，并规范了一套业务实现的代码结构与操作流程，使 .Net Core 框架更易于应用到实际项目开发中。
Async/await first CQRS+ES and DDD framework for .NET
PeachPie - the PHP compiler and runtime for .NET and .NET Core
A .NET library to run C# code in parallel on the GPU through DX12, D2D1, and dynamically generated HLSL compute and pixel shaders, with the goal of making GPU computing easy to use for all .NET developers! 🚀
.NET Community Toolkit is a collection of helpers and APIs that work for all .NET developers and are agnostic of any specific UI platform. The toolkit is maintained and published by Microsoft, and part of the .NET Foundation.
Bridge between Lua and the .NET.
EPPlus-Excel spreadsheets for .NET
The .NET Standard / .NET Core version from the System Linq Dynamic functionality.
A home for your business logic in any .NET application.
Read and extract text and other content from PDFs in C# (port of PDFBox)
A lightweight text templating library written in C# which can be a drop-in replacement for string.Format
Fellow Oak DICOM for .NET, .NET Core, Universal Windows, Android, iOS, Mono and Unity
The Microsoft.VisualStudio.Threading is a xplat library that provides many threading and synchronization primitives used in Visual Studio and other applications.
DryIoc is fast, small, full-featured IoC Container for .NET
Microsoft Build Accelerator
.NET bindings for Direct3D12, Direct3D11, WIC, Direct2D1, XInput, XAudio, X3DAudio, DXC, Direct3D9 and DirectInput.
Extracts Exif, IPTC, XMP, ICC and other metadata from image, video and audio files
Cross platform Xamarin plugin to play and control Audio and Video
The StreamJsonRpc library offers JSON-RPC 2.0 over any .NET Stream, WebSocket, or Pipe. With bonus support for request cancellation, client proxy generation, and more.
Pure C# RTSP client for .NET Standard without external dependencies and with true async nature. I welcome contributions.
A GraphQL Client for .NET Standard
Modern OpenGL bindings for C#.
a cqrs and event sourcing framework for dotnet core using akka.net
Trady is a handy library for computing technical indicators, and it targets to be an automated trading system that provides stock data feeding, indicator computing, strategy building and automatic trading. It is built based on .NET Standard 2.0.
A TensorFlow-inspired neural network library built from scratch in C# 7.3 for .NET Standard 2.0, with GPU support through cuDNN
Easy C# API for Distributed Background Tasks/Jobs for .NET Core.
C# .NET MONO NOSQL ( key value store embedded ) ACID multi-paradigm database management system.
A simple to use TCP and UDP networking library for .NET. Compatible with Unity.
Delegate-based C# P/Invoke alternative - compatible with all platforms and runtimes.
A zero-configuration, highly-configurable, unopinionated object mapper with viewable execution plans. Flattens, unflattens, deep clones, merges, updates and projects queries. .NET 3.5+ and .NET Standard 1.0+.
Avalonia-based text editor (port of AvalonEdit)
Easy-to-use licensing library for .NET Framework, Mono, .NET Core, and Xamarin products
NLog as Logging Provider for Microsoft Extension Logging