Zeplin - Collaboration app for UI designers & frontend developers
Weld - Create websites with any design, for any device, for free, including domain.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Invision - Prototyping and collaboration for design teams
ActiveWords - Auto correct on steroids
InVision Design System Manager - Create and maintain your design system at scale.