This is a home page for logical frameworks providing pointers to further material, including a bibliography, implementations, some researchers in the area, and recent announcements and papers. logical framework is a formal meta-language for deductive systems. The primary tasks supported in logical frameworks to varying degrees are * specification of deductive systems, * search for derivations within deductive systems, * meta-programming of algorithms pertaining to deductive systems, * proving meta-theorems about deductive systems. I include here systems that in other places have been called meta-logics and meta-logical frameworks; for me the choice of terminology merely indicates the relative emphasis placed on these tasks. Logical frameworks have been applied to many examples from logic and the theory of programming languages.