Front End to VPNC, a command line VPN client for Cisco VPN hardware. This client is known to work on: Windows 2000, Windows XP, Windows 2003, Windows Vista, Windows 2008 and Windows 7. It supports both 32 bit (x86) and 64 bit (x64/x86_64).

ShrewSoft VPN Client is described as 'The Shrew Soft VPN Client is a free IPsec Remote Access VPN Client for both Windows 2000, XP, Vista and Windows 7 operating systems ( x86 and amd64 versions ) and for FreeBSD, NetBSD and Linux based operating systems' and is a VPN service in the security & privacy category. There are more than 10 alternatives to ShrewSoft VPN Client for a variety of platforms, including Mac, Windows, Linux, Android and iPhone apps. The best ShrewSoft VPN Client alternative is SoftEther VPN, which is both free and Open Source. Other great apps like ShrewSoft VPN Client are Tunnelblick, OpenConnect GUI, Avira Phantom VPN and Cisco AnyConnect.
Front End to VPNC, a command line VPN client for Cisco VPN hardware. This client is known to work on: Windows 2000, Windows XP, Windows 2003, Windows Vista, Windows 2008 and Windows 7. It supports both 32 bit (x86) and 64 bit (x64/x86_64).

PSecuritas is the most advanced, yet free IPSec client for Mac OS X. It supports virtually every available IPSec compliant firewall, allowing you to connect safely to your office or home network from any location on earth.
OpenVPN MI GUI is a Windows graphical user interface for the OpenVPN client management interface.
TheGreenBow VPN Client enables to work from home and to connect to enterprise infrastructure. From simple authentication to advanced full PKI integration .Support of both IPsec and SSL. Is an alternative for Shrewsoft vpn to Pfsense