The .NET Framework 4.0 contains a plethora of command line tools ranging from build, deployment, debugging, security to Interop tools, and so on. Here’s a list of important command line tools in the .NET Framework 4.0 which can be run using the Visual Studio Command Prompt. The description of these tools has been taken from the MSDN documentation.

Assembly, Build, Deployment and Configuration Tools

Tools Description
Al.exe (Assembly Linker) The Assembly Linker generates a file that has an assembly manifest from one or more files that are either modules or resource files.
Gacutil.exe (Global Assembly Cache Tool) The Global Assembly Cache tool allows you to view and manipulate the contents of the global assembly cache and download cache.
Ilasm.exe (MSIL Assembler) The MSIL Assembler generates a portable executable (PE) file from Microsoft intermediate language (MSIL)
Ildasm.exe (MSIL Disassembler) The MSIL Disassembler is a companion tool to the MSIL Assembler (Ilasm.exe). Ildasm.exe takes a portable executable (PE) file that contains Microsoft intermediate language (MSIL) code and creates a text file suitable as input to Ilasm.exe.
Installutil.exe (Installer Tool) The Installer tool is a command-line utility that allows you to install and uninstall server resources by executing the installer components in specified assemblies
Mage.exe (Manifest Generation and Editing Tool) and MageUI.exe The Manifest Generation and Editing Tool (Mage.exe) is a command-line tool that supports the creation and editing of application and deployment manifests.
Ngen.exe (Native Image Generator) The Native Image Generator (Ngen.exe) is a tool that improves the performance of managed applications. Ngen.exe creates native images, which are files containing compiled processor-specific machine code, and installs them into the native image cache on the local computer
Regasm.exe (Assembly Registration Tool) The Assembly Registration tool reads the metadata within an assembly and adds the necessary entries to the registry, which allows COM clients to create .NET Framework classes transparently.
Regsvcs.exe (.NET Services Installation Tool) The .NET Services Installation tool loads and registers an assembly, generates, registers, and installs a type library into a specified COM+ application and configures services that you have added programmatically to your class.
Resgen.exe (Resource File Generator) The Resource File Generator converts text (.txt or .restext) files and XML-based resource format (.resx) files to common language runtime binary (.resources) files that can be embedded in a runtime binary executable or compiled into satellite assemblies.
Storeadm.exe (Isolated Storage Tool) The Isolated Storage tool lists or removes all existing stores for the current user.

Security Tools

Tools Description
Caspol.exe (Code Access Security Policy Tool) The Code Access Security (CAS) Policy tool (Caspol.exe) enables users and administrators to modify security policy for the machine policy level, the user policy level, and the enterprise policy level
Certmgr.exe (Certificate Manager Tool) Manages certificates, certificate trust lists (CTLs), and certificate revocation lists (CRLs).
Makecert.exe (Certificate Creation Tool) The Certificate Creation tool generates X.509 certificates for testing purposes only. It creates a public and private key pair for digital signatures and stores it in a certificate file
Mscorcfg.msc (.NET Framework Configuration Tool) The .NET Framework Configuration tool (Mscorcfg.msc) is a Microsoft Management Console (MMC) snap-in that enables you to manage and configure assemblies in the GAC and adjust code access security policy
Peverify.exe (PEVerify Tool) Helps you verify whether your Microsoft intermediate language (MSIL) code and associated metadata meet type safety requirements.
SignTool.exe (Sign Tool) Sign Tool is a command-line tool that digitally signs files, verifies signatures in files, and time-stamps files.
Sn.exe (Strong Name Tool) The Strong Name tool (Sn.exe) helps sign assemblies with strong names. Sn.exe provides options for key management, signature generation, and signature verification.

Debugging Tools

Tools Description
Fuslogvw.exe (Assembly Binding Log Viewer) Displays information about assembly binds to help you diagnose why the .NET Framework cannot locate an assembly at run time.
MDbg.exe (.NET Framework Command-Line Debugger) and Sos.dll The NET Framework Command-Line Debugger helps tools vendors and application developers find and fix bugs in programs that target the .NET Framework common language runtime.

Interop Tools

Tools Description
Tlbexp.exe (Type Library Exporter) The Type Library Exporter generates a type library that describes the types defined in a common language runtime assembly.
Tlbimp.exe (Type Library Importer) The Type Library Importer converts the type definitions found within a COM type library into equivalent definitions in a common