What tools or libraries have you used in your projects?

In C# projects, I used various tools and libraries depending on the task:

• Entity Framework Core — for working with databases via ORM, simplifying queries and migrations.
• ASP.NET Core — for creating web applications and APIs.
• Newtonsoft.Json (Json.NET) — for serialization and deserialization of JSON.
• AutoMapper — for automatic mapping between objects of different types.
• NUnit / xUnit — for writing unit tests.
• Serilog / NLog — for logging.

For example, using Entity Framework Core to get a list of users:

using(var context = new AppDbContext())
{
    var users = context.Users.ToList();
}

The choice of tools depends on the project requirements and architecture.