FakeClients - Practise logo design using random generated client briefs
Polymail - Native email app for email productivity.
GoodBrief - A random generator for design briefs.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
Targeted.io - Test your email designs across 30+ clients before you send'm
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues