NetTraffic
Essential network bandwidth monitor.
18 Alternatives To NetTraffic
BitMeter
A feature-packed bandwidth meter for Windows, which includes a web interface for remote monitoring.
Comodo Firewall
Comodo Firewall Pro - Secure your system against internal attacks such as Trojan viruses /…
DU Meter
DU Meter is a network bandwidth monitor for your computer.
FreeMeter
Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.

GlassWire
Visualize network activity in detail, get notified when new apps access the network, look out for…

Little Snitch
Little Snitch is a firewall application that monitors and controls outbound internet traffic.
LoL Ping Checker
LoL Ping Checker (LPC) is a graphical tool showing your current ping delay.
MenuMeters for El Capitan
MenuMeters for OS X El Capitan 10.11 (and later)

NetBalancer
NetBalancer is a Windows application for local network traffic control and monitoring.
NetMeter
NetMeter (legacy)

NetWorx
NetWorx is a simple and powerful tool that helps you objectively evaluate your bandwidth situation.
Network Activity Indicator
Network Activity Indicator displays the old ’two monitors’ icon in Windows 7 that flashes blue to show network activity in the System Tray.
Network Lights
Network Lights is a Windows program, which blinks keyboard LEDs (Light Emitting Diode) indicating outgoing and incoming network packets on network interface.
OpenSnitch
OpenSnitch is a GNU/Linux port of the Little Snitch application firewall.
PRTG Network Monitor
An advanced network monitoring solution to monitor network up/downtime, traffic and usage.
TrafficMonitor
TrafficMonitor is a network monitoring suspension window software in Windows.
simplewall
Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on…

trafficWatcher
trafficWatcher is a small tool to monitor your network activity.