Windows: Remember Microsoft's Virtual Wi-Fi project for Windows 7? Well the project is officially dead, but the source code is still available, and free application Maryfi takes advantage of this to provide a software router that can share single-serve Wi-Fi networks such as those used at airports, hotels, etc.
Tethering and mobile hotspots such as Verizon's MiFi or T-Mobile's HotSpot are great if you're a frequent traveler or if your company is footing the bill. I travel to one or two conventions a year and usually tether to my phone's connection for Wi-Fi, but I didn't get a very good connection on the 37th floor and had to pony up for $15 for one day of unlimited Wi-Fi. Even worse was that the two friends I shared the room with used my laptop when they needed to check their email. If I had Maryfi, I could have just shared my hotel connection with everyone in the room.
Maryfi can share any type of internet connection on the host computer; other Wi-Fi enabled devices can see and join the Maryfi hotspot which can be secured with WPA2 encryption. Another use is to setup Maryfi as a repeater for your home router—this can help you stretch connectivity to a device just outside your current Wi-Fi range.
One app, Endless uses
With Maryfi you can share expensive airport Wi-Fi with co-workers,
create a hotspot in your Ethernet-only hotel or dorm room, even extend the range of your home router.
