ILSpy

Features:
- Decompilation to C#
- Whole-project decompilation
- Search for types/methods/properties
- Hyperlink-based type/method/property navigation
- Base/Derived types navigation, history
- Assembly metadata explorer
- BAML to XAML decompiler
- ReadyToRun binary support for .NET Core
- Extensible via plugins
- Additional features in DEBUG builds