Clarity – a worldwide group of lawyers and others who advocate using plain language in place of legalese.

Plain Language Association International – a nonprofit organization of plain-language advocates, professionals, and organizations committed to plain language.

Plain Language Action and Information Network – a voluntary association of US federal government and related employees dedicated to spreading plain language in the federal government.

Society for Technical Communication – the world’s largest and oldest professional association dedicated to the advancement of the field of technical communication.

Usability Professionals Association – an authoritative source on the practice of usability, user-centered design (UCD), and user experience (UX).