VMS Languages to ANSI Linux equivalent
VX/PASCAL: VMS PASCAL to C++ including PAS$() API Support for Linux and OpenVMS.
VX/BASIC: VMS BASIC to C including BAS$() API Support for Linux.
VX/COBOL: VMS COBOL to ANSI COBOL (MicroFocus, Fujitsu, open-COBOL) including COB$() API Support for Linux.
VX/CPP: VMS C to ANSI C, including DECC$() API Support for Linux.
VX/FORTRAN: VMS FORTRAN to ANSI FORTRAN Including FOR$() API Support for Linux and openVMS.
DCL and DCL COMMANDS for Linux
VX/DCL: DCL for Linux, supported VMS logicals, symbols, command files, lexcials: LIB$SPAWN() and LB$DO_COMMAND(), LIB$GET_SYMBOL(), LIB$GET_SYMBOL() etc.
VX/JSP: VMS PRINT and BATCH for Linux, SYS$SNDJBCW), SYS$GETQUI()
VX/MSG: VMS Message compiler for Linux : SYS$GETMSG(), SYS$FAOL(), SYS$FAO(), F$GETMSG()
VX/CLD: CLI$() and VMS Command Line Definition compiler for Linux
VXSOR: SOR$() API's - and SORT.EXE, MERGE.EXE - VMS SORT MERGE for Linux.
VX/LBR: LBR$() API's - and DCL LIBRARIAN command for Linux.
FORMS and SCREENS for Linux
VX/SMG: SMG$() - SMG Screen management for Linux
VX/FMS: FDV$() - FMS Forms Management System for Linux
VX/DECFORMS: FORM$() API's and DECForms compiler for Linux
VMS System Services and Call Compatible API's for Linux
VX/STR: STR()$ String Library APIs for Linux
VX/MTH: MTH$() Math Library APIs for Linux
VX/RMS: RMS for Linux: SEQ, REL, IDX files, FAB, RAB, XAB, NAM block support, SYS$OPEN(), SYS$CONNECT() etc for Linux
VX/FDL: FDL$() , CONV$() and ANALYZE, CREATE DCL commands - full FDL (File Description Language) for Linux
VX/OTS: OTS$() Data Conversion Routines for Linux
VX/EDT: EDT$() and TPU$() Callable Editors for Linux.
VX/RT: over 900 LIB$, SYS$ including above VX XXX$() API Call compatible libraries for Linux
Rdb to Oracle DB and Postgres ECPG
VX/SQLMOD: Rdb SQLMOD to Oracle Pro*C and Postgres ECPG
Sector7 have collected useful, everyday VMS / OpenVMS manuals in one place.
You should always check with VSI and their manual reference list: https://www.vmssoftware.com/documents_list.html
OPSY: OpenVMS and VMS
DOCUMENTS: PROGRAMMING MANUAL
OpenVMS / VMS COBOL Programming and Reference Manual
OpenVMS / VMS FORTRAN Programming and Reference Manual
OpenVMS / VMS PASCAL Programming and Reference Manual
OpenVMS / VMS PROGRAMMING I Programming and Reference Manual
OpenVMS / VMS PROGRAMMING II Programming and Reference Manual
OpenVMS / VMS DEBUGGER Programming and Reference Manual