This is a list of all fortran and c library routines, each with a few lines of description. I find it best to browse with xman . This is primitive but very direct and simple. Very quick search. This is another Cray documentation system.
Many technical manuals are here, in all their glory.
In particular language references and manuals are available. This is the reference for the Cray. Our cray has 8 vector processors. They are not fast scalar processors. 64 long vectors, so can be very fast at vector arithmetic.