Gambas is an IDE and BASIC interpreter with object-oriented extensions. It's designed to ease building graphical applications programs using Gtk+ or Qt, and runs on most Unix and Linux systems. With its runtime standalone applications can be packaged, even command-line programs. The Gambas3 JIT-compiling interpreter often executes faster than Perl or Python apps. It also supports SDL, OpenGL and OpenAL, MySQL or PostgreSQL databases, CGI webserver interfacing,
FreeBASIC is a multi-platform BASIC compiler with syntax similar to MS-QuickBASIC (including graphics statements). It adds features like pointers, unsigned data types, inline assembly, C and C++ bindings (e.g. Allegro, SDL, OpenGL, GTK+, Windows API), and a pre-processor with macro support. FBedit is an additional IDE to the compiler.
nuBASIC is a BASIC interpreter designed for educational purposes. It's implemented in C++11 and buildable on Linux or Windows. It allows programming simple games, educational or small business programs, comes with various examples, documentation, and a syntax highligting editor on Windows.
PC-BASIC is a cross-platform emulator for GW-BASIC 3.23, BASICA, PCjr Cartridge BASIC and Tandy-1000 GW-BASIC. It can run ASCII, bytecode and encrypted bytecode files, and supports the Microsoft Binary Format for floating point arithmetic. It includes graphics capabilities and sound output.