ReSharper and Rider 2025.3 have been released alongside the official .NET SDK, providing support for the latest C# 14 language features such as extension members, null-conditional assignments, and user-defined compound assignment operators. These JetBrains tools offer inspections, quick-fixes, and refactorings to help developers efficiently explore new features like extension members, which expand the concept of extension methods, and the field keyword, which has become stable for properties. The release also supports partial constructors and events, allowing more control over source generators, and addresses breaking changes involving Span<T> due to refined span conversion rules. Enhancements in ReSharper and Rider include syntax highlighting for user-defined operators, improved code inspections, and quick-fixes to ensure a seamless transition to C# 14, maintaining their reliability as essential tools for developers working with the latest .NET developments.