Emporter is described as 'Web developers: you can develop as you would on a real website, without having to buy or manage a server. If you're new to web development, we think Emporter is one of the easiest servers to use' and is an app in the Development category. There are three alternatives to Emporter for a variety of platforms, including Linux, Mac, Self-Hosted solutions, Windows and BSD. The best alternative is ngrok, which is free. Other great apps like Emporter are Packetriot (Freemium) and gw.run (Freemium).
ngrok exposes local servers behind NATs and firewalls to the public internet over secure tunnels. How it works You download and run a program on your machine and provide it the port of a network service, usually a web server.
Packetriot makes it simple to expose services and data on local and private networks to the Internet. You can serve static websites, dynamic web applications, test single-sign-on work-flows or build webhooks.
gw.run establishes a secure proxy between public internet and your internal app. Your application does not need to be exposed to the internet directly and therefore may reside on any machine behind firewall or NAT.