MaVerickBASIC is an Open Source Multivalue Database Management System. It includes MaVerickBASIC, a DataBasic compatible compiler.
Mapyrus is a BASIC-like language for creating plots of points, lines, polygons and labels to PostScript (high resolution, up to A0 paper size), Portable Document Format (PDF) and web image output formats.
Testalgo2 is a basic programming language
JBasic is a traditional BASIC language intepreter written in Java for command line or embedded use. It supports conventional GW-BASIC style syntax, plus some modern extensions for supporting threads, JDBC, etc. JBasic can be run directly from a shell.
From the product description: Grasshopper is a Visual Studio .NET plug-in, which enables you to use C# or Visual Basic .NET to develop, debug and deploy Web applications and Web services that run on Microsoft Windows, Linux and any Java-enabled platform. Grasshopper introduces a patent-pending compiler that compiles Microsoft Intermediate Language (MSIL) into standard Java bytecode. You can access external Java components regardless of the Java development environment in which they were originally developed.
N.A.M.E. compiles BASIC source code into java binaries. You can also run code in interpretive mode.
Mike Lehman’s HotTEA is an implementation of the BASIC language written in Java.