Private Eye is described as 'See connections in real-time: When an app makes a network connection, you see it instantly on your screen. There's no delay and you don't have to use a separate recording mode' and is a Network Monitor in the Network & Admin category. There are six alternatives to Private Eye for a variety of platforms, including Windows, Linux, Online / Web-based, PortableApps.com and SaaS. The best alternative is TCPView, which is free. Other great apps like Private Eye are PRTG Network Monitor (Freemium), CurrPorts (Free), Netactview (Free, Open Source) and PortsMonitor (Paid).
An advanced network monitoring solution to monitor network up/downtime, traffic and usage. Features include availability, performance, and bandwidth monitoring (SNMP, WMI, packet sniffing, NetFlow), instant alerts, reporting, failover clustering.
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.
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.