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RapidQ
Developer(s)	William Yu
Operating system	Microsoft Windows, Linux, Unix
Type	Programming
Website	rapidq.phatcode.net

RapidQ (also known as Rapid-Q) is a free, cross-platform, semi-object-oriented dialect of the BASIC programming language. It can create console, graphical user interface, and Common Gateway Interface applications. The integrated development environment includes a drag-and-drop form designer, syntax highlighting, and single-button compilation. Versions are available for Microsoft Windows, Linux, Solaris, and HP-UX.

Additional functionality not normally seen in BASIC languages are function callbacks and primitive object-orientation. The language is called semi-object-oriented by its author because there are only two levels of the class hierarchy: built-in classes, and user-defined classes derived from those; the latter cannot be extended further. The ability to call external shared libraries is available, thus giving full access to the underlying operating system's application program interface. Other capabilities include built-in interfaces to DirectX and MySQL.

RapidQ features a bytecode compiler that produces standalone executables by binding the generated bytecode with the interpreter. No external run time libraries are needed; the bytecode interpreter is self-contained. The file sizes of executable files created by RapidQ are about 150 kilobytes or larger for console applications.

RapidQ's author, William Yu, sold the source code to REAL Software, the makers of REALbasic, in 2000. The freely distributed program has been improved and many additional components have been created by an active user group.