TheGreenBow works with hundreds of different kinds of VPN hosts/servers. The trial version is fully functional so that you can test it. Cisco is no longer developing their VPN client so I don't think you're going to get your question answered.
The traditional Cisco IPSEC VPN client doesn't support Windows 8 and isn't in active development. You may want to try TheGreenBow IPSEC VPN client. It's in active development, has a free trial and great documentation.
If you're looking for an alternative client that supports Windows 8 and is still actively being developed, check out TheGreenBow IPSEC VPN Client. It's got a free trial and great documentation.