Wireshark

Professional network analyzer

Technitium MAC Address Changer

Change your network card's MAC

Hide IP

Maintaining your privacy is very simple with this program

NMapWin

Assess your network security by scanning ports

Advanced IP Scanner

Analyze the computers connected to your local network

Find MAC Address

A simple way to find out MAC addresses

Easy Hide IP

Hide your IP address and your geographic location

WinPcap

Library pack for network managers

RouterPassView

Discover the router passwords that you have forgotten

GFI LANguard

Check the vulnerabilities of your LAN network

Hamachi

Tool to create virtual private networks

WinBox

Management software for MikroTik routers

NetSpeedMonitor

Measure your Internet speed

DynSite

Automatically updates your dynamic IP, very useful for dynamic Internet connections

No-IP

Assign a name to your IP address

Cisco Packet Tracer

Find out how a network behaves

VintaSoftImaging.NET

Tool for .NET developers focused on working with images

Emu8086

A virtual machine that emulates Intel's 8086 processor

.NET Framework 4.5

Take a look at the new libraries and the new runtime environment

XNA Framework

The libraries that are necessary for XNA Game Studio games

.NET Framework Repair Tool

Fix problems with .NET Framework

.NET Framework 3.5

Develop good-looking applications for Windows

OpenGL

2D and 3D graphics standard

Windows Azure SDK

Toolkit to develop Azure applications

.NET Framework 4

All the components necessary to create Windows applications

Android SDK

Create Android applications with this development kit

Microsoft Surface SDK

Complete SDK for the Microsoft Surface multi-touch table