salaros 

MS Compound File Storage .NET Implementation

A slim, cross-platform, fully managed C# library for reading/writing .ini, .conf, .cfg etc configuration files.

A toolkit for processing .rfa, .rvt etc without Revit

A core implementation of all WakaTime C#-driven plug-ins for IDE such as Visual Studio, Xamarin Studio, Monodevelop etc

IsBizMail tells you whether a given email address is free (gmail.com, yahoo.es, yandex.ru etc) or not

Provides simple access to Mailgun's REST API from .Net applications: Send messages, create web hooks, manage mailboxes, etc.

A set of tools that help developers to interact with Web and other Internet resources

A toolkit for processing .dwg, .dxf etc without AutoCAD or RealDWG

The Software Development Toolkit (SDK) provides extensive .NET code samples and documentation to help you get started developing with the Revit API.

Provides common types for CAD and Revit toolkits

A set of useful extensions for .NET (works for old .NET Framework 4.5.x and .NET Standard 1.6+)

A C# .NET client for vTiger's Web Services APIs. Works well vTiger forks such as VTE CRM

A core implementation of all WakaTime C#-driven plug-ins for IDE such as Visual Studio, Xamarin Studio, Monodevelop etc. This plug-ins will help to collect metrics, insights and time tracking automatically generated directly from your programming activity.