The Visual Component Library (VCL) is a an objected-oriented application framework (software library) developed by Borland International for use with their Delphi compiler to create Microsoft Windows GUI applications. The C++ compiler/IDE that Borland developed - C++ Builder - can also use VCL to develop Windows GUI applications. A cross-platform equivalent to the VCL library was also created and called CLX. It was available for Delphi 7 and Kylix (a Linux version of Delphi).
In 2011 Embarcadero Technologies (who purchased Borland's software development products) began offering Delphi and C++ Builder developers an alternative GUI framework called FireMonkey. In addition to Microsoft Windows, FireMonkey can be used on Android, iOS, and OS X.