This particular client tool is available only for the Linux platform, but offers tons of options for configuration. Of course, because of the amount of available options, Gadmin VPN Client isn't the best tool for users who are less familiar with how VPNs work.
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Jack Wallen is an award-winning writer for TechRepublic and Linux.com. He’s an avid promoter of open source and the voice of The Android Expert. For more news about Jack Wallen, visit his website jackwallen.com.