My name is John and I'm a Guru here at Shopify!
Thanks for taking the time to share your query here on our merchant forums.
Check out a few of these and if you have any app-specific questions you can always reach out to the app developers using the email address or contact form on the app store page for info and support for their apps.
They are generally pretty happy to hear from prospective customers of theirs. :)
Best of luck with everything here!