Send to Dropbox - Email attachments to a Dropbox folder
Clerk Chat - SMS for Slack
Get My Receipts by cloudHQ - Organize your receipts in one click
Cato - Instant Spotlight-like search for your web browser.
OneBox.io - Sync e-mail attachments to GDrive, Dropbox, Box, or OneDrive
Slack App Directory - Your go-to for finding apps that work with Slack