My team and I just built a web tool that allows a user (in this case, marketers, event coordinators, group leaders of any sort) to quickly send SMS texts out to group(s) of recipients. A recipient can respond directly to that SMS and it will only go to original sender. So for example, a startup's sales team can quickly to quickly send promotional SMS texts out to group(s) of customers (given they've opted in) and the customer can respond directly to that SMS and it will only go to the original sender.
Send an email to firstname.lastname@example.org with the subject “Texted.io SMS” if you want an invite to try out the platform! You’ll get 1000 texts (to send or receive).