L4LIB is a FORTRAN90 library which contains many utility routines for "L4" or "one byte logical" arithmetic.
The computer code and data files made available on this web page are distributed under the GNU LGPL license.
L4LIB is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
C4LIB, a FORTRAN90 library which implements certain elementary functions for single precision complex (C4) variables.
C8LIB, a FORTRAN90 library which implements certain elementary functions for "C8" or double precision complex variables;
I4LIB, a FORTRAN90 library which contains many utility routines, using "I4" or "4 byte integer" arithmetic.
R8LIB, a FORTRAN90 library which contains many utility routines, using "R8" or "double precision real" arithmetic.
SUBPAK, a FORTRAN90 library which contains many utility routines;
You can go up one level to the FORTRAN90 source codes.