Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack
Anvil PDF Filling API - The easiest way to programmatically populate any PDF
Quip: Team Documents for Slack - Create, share and get notified about Quip docs in Slack
KDAN Mobile PDF Reader - PDF Reader is the one app you can rely on when you need a portable solution to work with PDFs.
Workflowy - A better way to organize your mind.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request