Shimo!

SoftEther VPN ("SoftEther" means "Software Ethernet") is one of the world's most powerful and easy-to-use multi-protocol VPN software. It runs on Windows, Linux, Mac, FreeBSD and Solaris.

Tunnelblick is a free, open source graphic user interface for OpenVPN on OS X and macOS. It provides easy control of OpenVPN client and/or server connections.

Fruho is an open-source, zero-configuration VPN manager. It supports automatic setup and allows easy switching between VPN providers.

Make the VPN experience simpler and more secure with the enhanced remote access technology of Cisco AnyConnect Secure Mobility Client. This software builds on prior Cisco AnyConnect VPN Client offerings to improve the always-on VPN experience across more laptop and smartphone-based mobile devices, including laptops using Microsoft Windows 7.

Say Hello to Sidestep

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. It was originally developed to provide secure communications between mobile Windows hosts and open source VPN gateways that utilize standards compliant software such as ipsec-tools, OpenSWAN, FreeSWAN, StrongSWAN, isakmpd. It now offers many of the advanced features only found in expensive commercial software solutions and provides compatibility for VPN appliances produced by vendors such as Cisco, Juniper, Checkpoint, Fortinet, Netgear, Linksys, Zywall and many others.The Linux version supports most of the features availalble in the Windows VPN Client version with the exception of those which are not cross platform compatible. »

OAST is a cross-platform front-end (GUI) for OpenVPN-client, allowing to manage multiple. Its quite simple in use and provides base functionality such as monitoring connection status. Application is written in Java so it works on both Windows and Linux

OpenVPN Manager is a tool which controls OpenVPN. It is written in C# and uses the management interface of OpenVPN to control connections. Use the smart card feature in a simple way, enter passwords, monitor the OpenVPN log etc... The goal is to be a simple but powerful OpenVPN GUI.

tunXten is a lightweight but powerful OpenVPN GUI client for the Windows platform. It takes OpenVPN usability to the next level by providing intuitive, easy to use way to handle an unlimited number of OpenVPN configurations.

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).

VPN Tracker is the market leading VPN client for Mac OS X, developed for professional use by consultants and businesses. VPN Tracker supports IPSec VPN, L2TP VPN, PPTP VPN, Cisco Meraki, Cisco EasyVPN, SonicWALL, and other VPN standards. Your VPN connection secures the data between your Mac and remote networks. VPN Tracker is the Market-leading VPN solution for Apple Mac OS X and macOS. For businesses, employees, remote workers and consultantsManufacturer-independent: supports over 300 IPSec, L2TP & PPTP VPN gatewaysVPN Software optimized for macOS Sierra and compatible with High Sierra. »

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.