One backend for three tools. Pick a tool to see how to set it up, add the sign-up panel to your site and export the list.
Collect sign-ups before launch. The panel tells each visitor their place in the order people joined.
Gather subscribers for a launch, write issues in an HTML editor, and queue each campaign for every active subscriber.
Keep contacts in one place. Add them by hand or through a sign-up panel, and export the list as CSV at any time.