XLL+ is a toolkit to aid C/C++ programmers in the construction of Excel add-in libraries. XLL+ contains tools and C++ class libraries that make it very easy and safe to produce high-performance Excel add-ins. The XLL+ class library wraps the Microsoft Excel SDK with simple, intuitive C++ classes, and the Wizards create all the code for you. The user needs very little knowledge of Excel or the SDK. Add-ins produced with XLL+ contain no Visual Basic code; they are authored entirely in C and C++.