EFL

from The Free On-line Dictionary of Computing (8 July 2008)

Extended Fortran Language
EFL

   (EFL) A {Fortran} {preprocessor} to provide {structured
   programming} constructs much like {C}.  EFL is a descendant of
   {RATFOR}.  It is written in C.

   ["An Informal Description of EFL", S.I. Feldman].

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

EFL
       Eiffel Forum License (Eiffel)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

EFL
       Emitter Follower Logic (IC)