Quip: Team Documents for Slack - Create, share and get notified about Quip docs in Slack

GoVisually - GoVisually empowers creative teams to deliver better designs, by providing a simple way to review and approve designs quickly and easily

Quip - Quip is the modern productivity suite that simplifies your life and helps your team get work done faster.

Ziflow - Online Proofing software from Ziflow keeps teams connected and collaborating by providing a single source of truth for creative review and approval.

Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack

Ashore App - Built for agencies and creatives, Ashore is an automated design approval system combined with approval workflow software. Get started for free!