The official UK PIC Basic Compiler web site.

Make programs for PICmicro without having to learn the relative complexity of assembly, or opacity of C. Crownhill Associates, Ltd. [Free and commercial versions]

Reporting on the lost Altair BASIC source code [The Register]

Open Source GPL BASIC interpreter supporting Win32, UNIX, Linux. Rich set of features, many built-in functions. External modules written in C. Modular. Interpreted internal code. Internal code cache for fast execution. Compiled to C. Source is pure C.

Very complete FAQ page with many links to other BASIC sites.

Windows BASIC-like script interpreter for Windows versions with Internet Explorer 5.5 or higher. Developed in Power Basic.

Windows programming languages Ubercode, a BASIC-like language, and Visual Fred, a VisualBasic-compatible language.

WarkenSoft Productions is dedicated to bringing quality BASIC programming to the WWW.

Contains executable to allow you to run PlayStaion2 programs programmed in YaBasic as well as links, FAQs and sample programs. [Open Source]

A BASIC shell script interpreter for UNIX/Linux with full X11-Graphics support. [Open source, GPL]