OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. Starting with the fundamental premise that complexity is the enemy of security, OpenVPN offers a cost-effective, lightweight alternative to other VPN technologies that is well-targeted for the SME and enterprise markets.
HamachiX is the frontend for Mac OS X to hamachi, a secure mediated VPN client. This allows to create virtual private networks between many clients through firewalls in most cases.
SSL-Explorer is a fully-featured, web-based SSL VPN server. This practicable remote access security solution includes SSL tunneling, intranet website proxying, access to multiple file systems and application launching/tunneling through a standard browser
At this time, m0n0wall can be used as-is with the Wireless Router Application Platform from PC Engines (www.pcengines.ch), the net45xx/net48xx embedded PCs from Soekris Engineering (www.soekris.com) or most standard PCs (with a BIOS that supports booting