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VPN software lets you join private networks as though you're sitting at a local computer on that network, giving you access to shared folders and tons more handy stuff. Here's a look at five of the most popular VPN tools.

VPN software brings the security of a private network to an insecure network, and allows you to access private local networks from anywhere. As we've explained in the past, you can do things between computers on your local network you can't from out on the internet: like listen to a shared iTunes library or access files in shared folders. Virtual private network applications give you access to your computer from anywhere on the internet as if you were home on your local network. Earlier this week we asked you to share your favorite software for establishing and maintaining virtual private networks. We rounded up the votes, and now we're back with the five most popular VPN applications.

If you're new to the idea of virtual private networks, you can read up on the technical nitty-gritty at the Wikipedia entry for VPNs. Note: This Hive Five contains both VPN server applications (the apps that create virtual private networks on your local network so it's accessible from the outside world) and VPN client applications (the apps that connect to virtual private networks from the outside world). In many instances companies produce VPN servers, VPN clients, VPN servers with accompanying clients, or VPN clients that are designed to work with a variety of servers.

Hamachi's strongest attribute is its ease of use. If you've read some of the other entries in the Hive Five and realized that you don't want a contract for a corporate VPN or the hassle of configuring a bunch of routers with open-source firmware packages, and you just want to set up a simple virtual network between you and your friend, your phone, or your office, Hamachi offers nearly instant deployment. Install the Hamachi client on all the machines and devices you want to connect into your network and add them to your Hamachi VPN and you're done. It's dead simple. The downside, if you're concerned about it, is that your VPN isn't locally managed—it's centrally managed by Hamachi through their servers.

Windows has a built-in VPN client. Surprised? Many people are. It's not a heavily advertised feature, but it covers many people's needs. Before exploring other client solutions, it's worth pulling up the quick launch box in the Windows start menu and typing "VPN" to start the configuration process. In Windows versions prior to Windows Vista, the built-in VPN client received a fair amount of criticism for lacking features and supported protocols. Since Vista and especially in the Windows 7 implementation, it's grown significantly and unless you need a feature or standard that isn't implemented you may not need to install anything at all.