MailClark - The Slack bot for external communications
Stickman: Draw animation - Stickman: Draw animation is an animation editing tool that allows you to create your own animated movies in a few minutes.
Alert.email - Get your important emails delivered to a Slack channel
PixelArtPaint pro - PixelArtPaint pro is a great pixel editor app that allows you to create and edit pixel art on your mobiles.
Clubble.io - Answer emails via Slack.
ibis Paint X - Drawn with + ibisPaint