SlackPass - Subscription access to anything with Slack
Usersnap - Visual Feedback - Usersnap helps your business with its versatile feedback platform to build better, more successful products and services with the help of user feedback. Collect feedback along your product development lifecycle. Try it for free.
Magik for Slack - Magik enables founders, marketers & community builders to create the community experience they never knew was possible.
BeFrank - Feedback platform for graphic designers
Community Inviter - Auto invitations for Slack
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.