A general term that includes: (i) developers or manufacturers of information systems, system components, or information system services; (ii) systems integrators; (iii) vendors; (iv) and product resellers. Development of systems, components, or services can occur internally within organizations (i.e., in-house development) or through external entities.
Sources:
CNSSI 4009-2015

  The party that develops the entire entropy source or the noise source.
Sources:
NIST SP 800-90B under Developer

  A general term that includes developers or manufacturers of systems, system components, or system services; systems integrators; vendors; and product resellers. Development of systems, components, or services can occur internally within organizations or through external entities.
Sources:
NIST SP 800-37 Rev. 2

  A general term that includes developers or manufacturers of systems, system components, or system services; systems integrators; vendors; and product resellers. The development of systems, components, or services can occur internally within organizations or through external entities.
Sources:
NIST SP 800-53 Rev. 5

  A general term that includes developers or manufacturers of systems, system components, or system services; systems integrators; suppliers; and product resellers. Development of systems, components, or services can occur internally within organizations or through external entities.
Sources:
NIST SP 800-161r1 from NIST SP 800-53 Rev. 5 - adapted

  A person, team, or organization that creates an Informative Reference.
Sources:
NISTIR 8204 under Developer

  A person, team, or organization that creates an OLIR and submits it to the National OLIR Program.
Sources:
NIST IR 8278Ar1 under OLIR Developer
NIST IR 8278r1 under OLIR Developer