Free Download Injector

This utility provides a mechanism to inject a Dynamic Link Library (DLL) into an arbitrary process.

A number of the other utilities on this site (e.g. Adjust Tick Count and Stack Shot) work by injecting a DLL into another process. While developing these applications, I've found it invaluable to be able to develop the 'engine' of the application (i.e. the injectable DLL) before writing the corresponding UI.