HitPay - Send or receive money using a modern payments interface

Slack - A messaging app for teams who see through the Earth!

Unlock - Monetize your content with a few lines of code

Mattermost - Mattermost is an open source alternative to Slack.

Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.

Quip Chat Rooms - Real-time chat with your team