VPN Client for Windows

https://www.shrew.net/software
https://www.shrew.net/static/help-2.1.x/vpnhelp.htm

1. Introduction
2. Features and Compatibility
3. System Requirements
4. Known Issues
5. IPsec Overview
6. Using the VPN Client

Windows Platforms

---

The Shrew Soft VPN Client for Windows is an IPsec Remote Access VPN Client for Windows 2000, XP, Vista and Windows 7/8 operating systems ( i386 and x64 versions ). 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 and provides compatibility for VPN appliances produced by vendors such as Cisco, Juniper, Checkpoint, Fortinet, Netgear, Linksys, Zywall and many others.

Product Editions

---

The Shrew Soft VPN Client for Windows is available in two different editions, Standard and Professional. The Standard version provides a robust feature set that allows the user to connect to a wide range of open source and commercial gateways. It contains no trial period limits, nag screens or unrelated software bundles. It is simply free for both personal and commercial use.
https://breakwall.net/2012/10/shrew-soft-vpn-client-reverts-back-to-version-2-1-7/