Google

Material Design

Monzo

Tone of Voice

Microsoft

Style Guide & Voice

IBM

Content Design Guidelines

NSW Government

Writing Guidelines

University of Leeds

Tone of Voice Guidelines

Slack

Voice and Tone

Adobe

Voice and Tone

GOV.UK

Voice & Style Guide

Atlassian

Writing Style

MailChimp

Content Style Guide

HubSpot

Voice and Tone

Canada Post

intuit

Voice and Style Guide

Monday

Voice and Tone Guide

Salesforce

Voice and Tone

PatternFly

Content style guide

Shopify

Voice and Tone

Buffer

Voice and Tone Guide