Freeware: Abracode

Contextual Menu Workshop 1.5Contextual Menu Workshop is a free framework for creating Contextual Menu plug-ins for Mac OS X. This package contains C, C++, ObjC, ObjC++ and AppleScript sources which are useful for developers only.

OnMyCommandCM 1.6.1OnMyCommandCM is a UNIX CLI and AppleScript executor. Your command may take a clicked object as a parameter so you may perform an action on file, folder or text. A command can be executed in terminal, silently or with output window.