Windows Apps for Network Tools

Wireshark
Free

Advanced IP Scanner
Free

PRTG Network Monitor
Free to try

PuTTY Portable
Free

NetworkMiner Packet Analyzer
Free

WinPcap
Free

AbsoluteTelnet Telnet SSH and SFTP Client
Free to try

ActiveXperts Network Monitor (32-bit)
Free to try

ActiveXperts Network Monitor (64-bit)
Free to try
Capsa Free
Free
Iperf
Free

Technitium MAC Address Changer
Free

Freegate
Free

Advanced Port Scanner
Free

Look@LAN Network Monitor
Free

SMAC MAC Address Changer
Free to try

CommView for WiFi
Free to try

NetSpeedMonitor (64-bit)
Free

Bandwidth Monitor Pro
Free to try

LAN Speed Test
Free

NetInfo
Free to try

Broadband Speed Test
Free

Wake On LAN
Free

CommView
Free to try