CheatSheet is lets you view available keyboard shortcuts in your current application. Just hold the ⌘-Key a bit longer to get a list of all active short cuts of the current application. It's as simple as that.
Email Monster is an email editor to build beautiful, responsive emails quickly and easily. Hundreds of free templates are available with a powerful built-in email editor to quickly edit and download your template.
Shortcuts.design is a small website that lists every shortcut a designer ever wants to know, all designapps in one place and in a simple and clear way. It's very usefull for beginning designers to quickly charge their workflow, when you switched to a new designtool or when you just want a reference for repeating actions!
Templates by EmailOctopus is a series of free, open-source, responsive email templates which can be used in your next project.