TCPView is described as 'Windows program that will show you detailed listings of all TCP and UDP endpoints on your system, including the local and remote addresses and state of TCP connections' and is an app in the Network & Admin category. There are more than 10 alternatives to TCPView for Windows, Linux, Android and Mac. The best alternative is CurrPorts, which is free. Other great apps like TCPView are TcpView For Linux (Free, Open Source), NetStat Agent (Paid), Netactview (Free, Open Source) and Connections Viewer (Free).
NetStat Agent is a powerful and easy-to-use network toolkit for monitoring and diagnosing. It includes all useful network tools like netstat, ping, traceroute, ipconfig, dns query (nslookup), whois, arp, route and http checker.
Netactview is a graphical network connections viewer for Linux, similar in functionality with Netstat. It includes features like process information, host name retrieval, automatic refresh and sorting.
Proc Net Monitor is the FREE software to monitor & analyze the Network activity of all running Process on your system. It shows all open network Ports (TCP/UDP) and active Network Connections for each process.
PortsMonitor is a system utility for monitoring system TCP/IP network connections by application, and connections' status. With Search Expression support, you can filter connection with preferred conditions.
TCPEye is an easy-to-use monitoring application that will display a list of all network processes. It sports all the features of "netstat" command and adds some options of its own as well as some third party online tools for IP tracing.