GlassWire displays your network activity on an easy to understand graph while searching for unusual Internet behavior that could indicate malware or violations of your privacy. Once unusual network activity is discovered you’re instantly alerted with detailed information so you can protect your computer, privacy, and data.
WiFiPerf is a bandwidth performance measurement app for iOS, Android, and Mac OS X. It can operate as a client and/or server. Use WiFiPerf for Mac OS-to-Mac OS, iOS/Android-to-iOS/Android, testing or iOS/Android-to-Mac OS testing.
ZMap is an open-source network scanner that enables researchers to easily perform Internet-wide network studies. With a single machine and a well provisioned network uplink, ZMap is capable of performing a complete scan of the IPv4 address space in under 45 minutes, approaching the theoretical limit of gigabit Ethernet.
dummynet is a live network emulation tool, originally designed for testing networking protocols, and since then used for a variety of applications including bandwidth management. It simulates/enforces queue and bandwidth limitations, delays, packet losses, and multipath effects. It also implements various scheduling algorithms. dummynet can be used on the machine running the user’s application, or on external boxes acting as routers or bridges.
ngrep strives to provide most of GNU grep’s common features, applying them to the network layer. ngrep is a pcap-aware tool that will allow you to specify extended regular or hexadecimal expressions to match against data payloads of packets.