Matrix Plugin for REALbasic 2008 and later allows you to construct programs which, because of operator and function overloading, can handle real matrices much like doubles and integers are handled. Matrix elements are doubles. A matrix can be entered in standard form in a TextArea and read in by a single instruction. It is a Mac OS X Universal, Windows, and Linux plugin. Included is a test REALbasic project and a test SVD project. Matrix Plugin was programmed in C++ using Xcode 3.2.1 for the Mac, MinGW and MSYS for Windows, and Ubuntu 9.04 for Linux.