VSI BASIC for OpenVMS is the latest name for a dialect of the BASIC programming language created by Digital Equipment Corporation (DEC) and now owned by VMS Software Incorporated (VSI). It was originally developed as BASIC-PLUS in the 1970s for the RSTS-11 operating system on the PDP-11 minicomputer. It was later ported to OpenVMS, first on VAX, then Alpha, Integrity, and most recently x86-64.
Past names for the product include: BASIC-PLUS, Basic Plus 2 (BP2 or BASIC-Plus-2), VAX BASIC, DEC BASIC, Compaq BASIC for OpenVMS and HP BASIC for OpenVMS. Multiple variations of the titles noting the hardware platform (VAX, AlphaServer, etc.) also exist.