FreeBASIC: A Powerful, Open-Source BASIC Compiler

FreeBASIC is a free and open-source (GPL) BASIC compiler for Windows, DOS, and Linux. Highly compatible with QuickBASIC, many QuickBASIC programs compile and run with minimal changes in FreeBASIC's 'QB' mode. However, FreeBASIC's default mode offers enhanced features and supports procedural, object-oriented, and meta-programming paradigms. It generates console and GUI executables, dynamic and static libraries, and offers C and partial C++ library support. Its speed rivals mainstream tools like GCC.