Ilspy – ILSpy is the open-source .NET assembly browser and decompiler.
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.
WKTVBDebugger– A debugger for Visual Basic P-Code compiled apps.
Semi-vd-decompiler – Partial decompiler for Visual Basic.
P32Dasm – VB5/VB6 Pcode decompiler.
Delphie DeDe – DeDe is a very fast program that can analyze executables compiled with Delphi.
AutoIt AutoIt3 Decompiler – This application can be used to decompile AutoIt scripts.