Whatis - Manage & organize your team's knowledge straight from Slack
Rebrandly - Rebrandly is the easiest way to create, share and manage branded links.
Slack-News - Read news from multiple sources within Slack by just typing
netboard.me - netboard.me allows you to combine all your content into a beautiful single web page.
Slack It - A bookmarklet to share links in Slack with one click
WhatsApp Share Link Generator - A handy tool to generate WhatsApp sharing links.