The design idea of NetLimiter is to completely and reasonably control, distribute the Internet traffic/bandwith for various network software, so as to make sure they can run smoothly at the same time without disturbing each other. While in AppNee's view, its powerful and perfect Internet connection monitoring & statistics functions (with very comprehensive data) are really helpful to system security and computer efficiency management.
AppNee figured out that only very few people like or are used to use firewall, whether it's the one Windows built-in or from a variety of antivirus software. As a security software, GlassWire abandoned the tedious UI and operation in traditional security, monitoring software, instead, it visualized all the normal and useful operation - which is just the easiest to be accepted by non advanced users.
Above all things, you have to know what port forwarding/port mapping is. Port forwarding refers to the mechanism of packets forwarding. Its essence is firewall's configuration strategy. But its function mainly focuses on packets forwarding, in order to achieve the purpose of operating specific packages (IP address parsing and filtering based on destination port number). As a consequence, it is generally taken out as an independent concept.