RaidenFTPD

Incredible FTP server for Windows

AbsoluteTelnet

Connect to another computer by Telnet or SSH

Apache HTTP Server

Install a powerful web server on your computer

PuTTY

A terminal emulator to remotely access servers

FileZilla Server

Powerful FTP Server that's totally free

Cerberus FTP Server

Install an FTP server on your computer

AppServ

Excellent software application to install a web server

Vedivi

Control your home PC from any other computer

Simple DNS Plus

Create your own DNS server and increase your browsing speed

VNC

Control any computer remotely

Mercury/32

Configure an mail server on your PC

Exchange Server 2013

The perfect solution for corporate email

UpRight

Upload files to Amazon S3

NoMachine

Like the former NX client, but much more secure

Active Search Engine

Install you own Web search engine on your server

ShowMyPC

Instant remote access to computers on the Internet

Nmap

Easily audit your local network

Technitium MAC Address Changer

Change your network card's MAC

Network Inventory Advisor

Control the software and hardware that connects to your networks

Cisco Packet Tracer

Find out how a network behaves

Fing

Scan and analyze your computer network

GFI LANguard

Check the vulnerabilities of your LAN network

WinBox

Management software for MikroTik routers

Open Ports Scanner

Stay informed about which ports are open

WinPcap

Library pack for network managers

Hamachi

Tool to create virtual private networks

inSSIDer

Scan nearby Wi-Fi connections

NetSpeedMonitor

Measure your Internet speed

RouterPassView

Discover the router passwords that you have forgotten

DameWare NT Utilities

Allows network administrators to improve how they control PCs

Wireshark

Professional network analyzer