<tool, programming, product> 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)

The evo-devo gene toolkit is the small subset of genes in an organism's genome whose products control the organism's embryonic development. Toolkit genes are central to the synthesis of molecular genetics, palaeontology, evolution and developmental biology in the science of evolutionary developmental biology (evo-devo).

A widget toolkit, widget library, GUI toolkit, or UX library is a library or a collection of libraries containing a set of graphical control elements (called widgets) used to construct the graphical user interface (GUI) of programs.