Before launch check discover how your mobile users feel https://ready.mobi/
For making screenshots (web versions) https://www.screely.com/
Launching Phantombuster for the first time on Product Hunt, all our team got to feel experience how thrilling and stressful is a Product Hunt Launch. https://productwars.phantombuster.com/
Mockups Design is a site where you can find free premium mockups that can be used in your private and commercial work. https://mockups-design.com/
‍Hotjar allows you to gain an insight into how your users interact with your website and what they are clicking on. https://www.hotjar.com/
For making screenshots (Android and iOS versions) https://theapplaunchpad.com/
For creating logo (offers tons of cools options) https://www.freelogodesign.org/
The best new way to monitor your launch day on Product Hunt powered by machine learning. https://pw2.akkio.com/
For creating promotional images https://create.vista.com/product-hunt/
Upvote Bell is the project management platform for Makers which launched their projects on Product Hunt. https://upvote-bell.com/
Tool for previewing and preparing PH submission https://previewhunt.com/
Find and download the best high-quality photos, designs and mockups https://www.freepik.com/
Hootsuite allows you to schedule and manage all your social media posts from one dashboard. https://www.hootsuite.com/
After launch find where to get press coverage for your startup https://submit.co/
For email newsletter after launch: A large collection of good product email design. https://reallygoodemails.com/
Monitor backlinks to your (or your competitors') website https://monitorbacklinks.com/