Custom software development is a procedure of establishing, designing, deploying, and maintaining software applications to meet the particular requirements of an individual and organization.
Contrary to commercial off-the-shelf software (COTS), its main target is to cater to a broad set of requirements, solve particular problems, and permit it to be marketed as a product and distributed as well. For instance: Sitebuilder and Microsoft Office are international software development companies that are packaged and marketed as commercial products and service providers. They are classified to provide the generalized requirements of website development and office productivity.