#csharp

A utility library providing various method() related operations

A collection of regular expressions that are generated at compile time

A high-performance, reusable StringWriter that avoids unnecessary allocationsby clearing and reusing its internal StringBuilder instance.

A utility library for TimeSpan related operations

A lightweight validation module for validating HTTP Basic Authentication credentials.

A validation module for validating HTTP Basic Authentication credentials in Functions.

A validation module checking for Gmail account existence

Automated .NET SDKs for your APIs

Generated C# SDK based on official Firecrawl OpenAPI specification

High-performance .NET BPE tokenizer — up to 618 MiB/s, competitive with Rust. Zero-allocation counting, multilingual cache, o200k/cl100k/r50k/p50k encodings + HuggingFace tokenizer.json support.

High-performance web crawling engine with bindings for 11 languages

C# Library for Artesian

General purpose library for Gbx files - data from Nadeo games like Trackmania or Shootmania, written in C#/.NET. It supports high performance serialization and deserialization of 400+ Gbx classes.

BB84.Extensions is a comprehensive collection of extension methods for the .NET framework and Windows Forms applications. The project consists of two main libraries that provide utility methods to simplify common programming tasks and enhance developer productivity.

.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.

C#/.NET client library for the Bitfinex.com cryptocurrency exchange REST and WebSocket APIs, supporting Spot and Futures trading and market data with strongly typed models.

.NET framework for A/B testing, feature flags, trial fallback, and observability.

A Semantic Kernel connector that bridges your local Claude Code OAuth session into Microsoft Semantic Kernel — no manual API key management needed.

Async-first .NET workflow and pipeline engine with middleware, branching, parallel execution, and saga support.

Provides an easy way to implement Smart Enums, Value Objects and Discriminated Unions in .NET

Observable .NET object graphs with MQTT, OPC UA, and WebSocket sync

A pure C# Open Source QR Code implementation

A modern, high-performance UUID library for .NET ecosystem. Features time-ordered identifiers, cryptographic security, multiple encoding formats and seamless Guid compatibility. Thread-safe, cross-platform and perfect for distributed systems. 🚀

Fully featured .NET library in C# to build MTConnect Agent, Adapter, and Client Applications. Pre-built Agents with Windows Installers. Support for Windows and Linux. Supports MTConnect Versions up to 2.7. Supports .NET Framework 4.6.1 through .NET 10

A comprehensive and efficient low-contention thread pool for easily managing both sync and async workloads. It provides granular work control, flexible concurrency, and robust error handling.

C#/.NET test automation framework for web

EntityFrameworkCore provider for multitier applications. Eliminates the need to handcraft custom CRUD and query APIs for client-server apps by letting your client frontend interact with a standard DbContext.

High-performance CBOR (RFC 8949) serialization framework for .Net (C#)

The DNSimple API client for C#.

WebSharper - Full-stack, functional, reactive web apps and microservices in F# and C#