Papermind - Papermind Slack App is a collaborative article-editing and document management platform for 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.
Quip: Team Documents for Slack - Create, share and get notified about Quip docs in Slack
Jotform - Free Online Form Builder & Form Creator
Workflowy - A better way to organize your mind.
Pdf.to - Convert PDF to Word, Excel, JPG, & from. Also compress PDF