Telerik JustDecompile is a free, open-source decompiler developed by Telerik, a renowned software company. It supports decompilation of .NET assemblies, including .NET Framework, .NET Core, and .NET Standard. JustDecompile allows developers to view the source code of assemblies, even if they do not have access to the original source code. This tool is particularly useful for debugging, troubleshooting, and reverse engineering.