Free security and privacy product ensures your anonymity while on-line

AirPort Radar is a free and convenient tool for quickly scanning the area for AirPort and other wireless networks.

Google Talk, Skype, etc

Article on Meraki

Wifi Liberator is an open-source toolkit for a laptop computer that enables its user to "liberate" pay-per-use wireless networks and create a free, open node that anyone can connect to for Internet access.

"Passive stumbler for Mac OS X"

Using aircrack

Access everything from a phone

Wiki on Singapore hotspots. Mac-friendly.