Microsoft Business Solutions Great Plains, former Great Plains Software Dynamics and eEnterprise are Dexterity-written applications. Also small business line: Microsoft Small Business Manager or Small Business Financials is written in Dexterity and uses the same code base as Great Plains. The history of the Dexterity. Great Plains Dexterity - is proprietary programming language and technology, designed back to earlier 1990th with the goal to build platform independent graphical accounting pack.