dnSpy

Combines decompilation, debugging with breakpoints and step-through execution, and assembly editing in C# or Visual Basic with IntelliSense, all without source code, as shown in the animated GIFs and feature list.

Specifically supports debugging Unity assemblies with the dnSpy-Unity-mono extension, making it unique for game reverse engineering, as noted in the building instructions.

Offers a public API, extensions, and a C# Interactive window for automating tasks and customizing workflows, highlighted in the debugger and assembly editor sections.

Includes a hex editor with metadata highlighting, IL editing, and tools for searching assemblies, enabling precise binary patching and analysis, as described in the hex editor and other features.