ReSharper

ReSharper is a commercial productivity extension for Microsoft Visual Studio developed by JetBrains. It enhances .NET development by providing advanced code analysis, refactorings, navigation, and other coding-assistance features integrated directly into the IDE.

Its core capabilities include on-the-fly code quality analysis with quick fixes, automated code generation, and a broad set of refactorings that help restructure code safely. It also offers code formatting and cleanup, intelligent navigation and search, numerous code templates, and a unit test runner for popular frameworks such as NUnit, MSTest, and xUnit. ReSharper provides cross-language inspections across languages and file types including C#, VB.NET, XAML, JSON, XML, HTML, CSS, and JavaScript.

ReSharper integrates into the Visual Studio editing experience and supports a range of development workflows from daily editing to large-scale refactoring and code maintenance. It is often used as part of the ReSharper Ultimate suite, which historically included dotCover, dotTrace, dotMemory, and dotPeek; ReSharper C++ is a separate product for C/C++ development.

For automation and CI workflows, JetBrains offers ReSharper Command Line Tools that perform static analysis and inspections without launching Visual Studio. Licensing is commercial, with subscription or perpetual options, and a free trial is available.

ReSharper is widely adopted in the .NET community as a tool to improve code quality and developer productivity, though it is a resource-intensive extension that can affect Visual Studio performance if not tuned.