Decompilers
.NET
DotPeek – dotPeek is a free-of-charge standalone tool based on ReSharper’s bundled decompiler. It can reliably decompile any .NET assembly into equivalent C# or IL code.
vb5.0/6.0
VB Decompiler Lite 11 (p-code, VB6) – Best code recovery solution for Visual Basic 5.0/6.0 applications and fast disassembler for Visual Studio .NET compiled apps.
Numega SmartCheck – SmartCheck is a run-time debugging tool that addresses the most problematic conditions encountered by Visual Basic developers.
Relyze: Relyze Desktop is available in two editions, either Standard or Professional. Relyze Desktop Standard is free to use for non commercial purposes and is available to download below.

Interactive Delphi Reconstructor (IDR): Interactive Delphi Reconstructor IDR (Interactive Delphi Reconstructor) – a decompiler of executable files (EXE) and dynamic libraries (DLL), written in Delphi and executed in Windows32 environment.
Last modified 1yr ago