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Essential Lahey Fortran 90
Essential LF90 Lahey no longer offers the free version of Essential Lahey Fortran 90. The complete Essential Lahey Fortran 90 language system is available at the educational price of US$79 (commercial price, US$195). If you need a full Fortran 77, 90, and 95 language system, LF95 Express is available for US$249. Multiple-copy pricing and site licenses are available for all Lahey language systems.

Essential Lahey Fortran 90 is for students, teachers, scientists, and engineers who want to write programs using the modern features of Fortran 90. Essential Lahey Fortran 90 removes obsolescent Fortran 90 features (arithmetic IF and assigned GO TO, for example). It eliminates clutter like the optional comma after a DO statement. Essential Lahey Fortran 90 imposes requirements where the Fortran 90 standard grants options (for example, IMPLICIT NONE is required in every program unit). And Essential Lahey Fortran 90 eliminates storage association (COMMON, EQUIVALENCE, and implicit procedure interfaces.) Essential Lahey Fortran 90 programs are easily maintained and run under LF95 (Express, Standard, and PRO) or any other compiler that supports the Fortran 90 standard. Note that Essential Lahey Fortran 90 will not compile a standard FORTRAN 77 program without some modification.