TOGAF
The Open Group Architecture Framework (TOGAF) is a methodology / library description method / approach (framework) for describing enterprise architecture that offers an approach for designing, planning, implementing and managing an enterprise IT architecture. TOGAF has been developed since 1995 by The Open Group based on the US Department of Defense TAFIM framework.
TOGAF is free and can be used free of charge by any organization to develop internal projects. Only commercial use is licensed.
TOGAF is a high-level design approach.