Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack
Free eSign Plan from PandaDoc - Legally-binding eSignatures 100% free with new PandaDoc plan
Quip: Team Documents for Slack - Create, share and get notified about Quip docs in Slack
GetAccept - GetAccept is a Sales tool for electronic signatures and sales document automation.
Workflowy - A better way to organize your mind.
Signaturely - Super simple eSignature software