The Free On-line Dictionary of Computing (30 December 2018):

B-Toolkit

    A set of software tools designed
   to support a rigorous or formal development of software
   systems using the B-Method.

   The Toolkit also provides a development environment automating
   the management of all associated files, ensuring that the
   entire development, including code and documentation, is
   always in a consistent state.

   The Toolkit includes: a specification, design and code
   configuration management system, including integrity and
   dependency management and source file editing facilities; a
   set of software specification and design analysis tools, which
   includes syntax checkers, type checkers and a specification
   animator; a set of verification tools, which includes a
   proof-obligation generator and automatic and interactive
   provers; a set of coding tools, which includes a translator,
   linker, rapid prototyping facilities and a reusable
   specification/code module library; a documentation tool for
   automatically producing fully cross-referenced and indexed
   type-set documents from source files; a re-making tool for
   automatically re-checking and re-generating specifications,
   designs, code and documentation after modifications to source
   files.

   A normal licence costs 25,000 pounds, academic 6,250 pounds.

   (1995-03-13)