Remote terminal application that allows roaming, supports intermittent connectivity, and provides intelligent local echo and line editing of user keystrokes.
Mosh is a replacement for SSH. It's more robust and responsive, especially over Wi-Fi, cellular, and long-distance links.
Mosh is free software, available for GNU/Linux, FreeBSD, and Mac OS X.
Virtual Router turns any Windows 7 or Windows 2008 R2 Computer into a Wifi Hot Spot using Windows 7's Wireless Hosted Network (Virtual Wifi) technology
KisMAC is free open source software. In our experience it is the best WiFi stumbling software for the Mac, supporting all standard Mac WiFi drivers and using monitor mode and passive scanning.
AutoAP is a script that continuously scans for open Wi-Fi connections, tests them for validity, and connects to the strongest signal. If the connection is lost, the script scans again and finds the strongest valid signal again, and maintains a continuous connection to the internet in a mobile or portable environment. The script paremeters are highly configurable, including ability to configure secure connections.