Top 20 NuGet fluent Packages

Send emails to Mailtrap. Uses FluentMailer.Smtp for delivery.
Send emails very easily. Use razor templates, smtp, embedded files, all without hassle. This is a Base Package and includes just the domain model, very basic defaults, and is also included with every other Fluent Mailer package here.
A .NET bot framework and command system for Telegram.
Port FluentEmail.Razor to dotnet core 3.1 Generate emails using Razor templates. Anything you can do in ASP.NET is possible here. Uses the RazorLight project under the hood.
A package to decorate (extend) a model with additional properties. This can be useful if you have a model shared on server-side and client-side (Blazor), where you want business logic be separated from the rendering logic. Fluent Decorator let you define this rendering logic in a centralized place.
Quickly and easily build REST APIs in C# using simple POCO models representing your data schema and an easy-to-use fluent configuration builder.
A test framework within which tests are defined using a fluent builder.
Option types for C# with LINQ support and rich fluent syntax for many popular uses: var maybeOne = "one".ToMaybe(); Maybe<string> maybeAnother; var maybeBoth = from one in maybeOne from another in maybeAnother select one + another; maybeBoth.Match( both => Console.WriteLine("...
Fluent reflections.
Fluent migrator runner tool
Package Description
Provides an opinionated framework for explicitly defining MediatR Request Pipelines using the Microsoft Service Collection DI system.
Provides core classes and interfaces for explicitly defining MediatR Request Pipelines.
Provides an opinionated framework for explicitly defining MediatR Request Pipelines using the Autofac DI system.
Send emails with FluentEmail via Postmark.
Flow orchestration framework for .NET applications
Validate input arguments, members or fields with Validate.That(…) call. One-line call per field, no extra classes required. Auto-disovers field name based on expression. Allows extending with own validators as well as overriding validation exception. Check out GitHub for more docs and usage exampl...
FluentMatch is a simple .NET library for string comparison and matching using a fluent syntax.
Different helper methods I use for all my personal projects as Csv import/export, Json export, background execution, fluent locking, etc