Poptop is an open source implementation of a PPTP server. Running under x86 or embedded Motorola ColdFire architectures Poptop provides full interoperability with the Microsoft PPTP VPN client.
A client implementation of Secure Socket Tunneling Protocol (SSTP) for Linux / Mac OS-X that allows remote access via SSTP VPN to Microsoft Windows 2008 Server.
This project has been moved to https://gitlab.com/eivnaes/sstp-client
vpnautoconnect is a daemon that allow you to reconnect automatically (at startup too) a vpn create with network manager.It can reconnect very quickly and monitor the bandwith, It works with pptp and openvpn connection.
RAS-SMS is a simple extension to Microsoft's Remote Access Service (RAS). RAS-SMS adds two factor authentication to standard VPN/PPTP clients on Windows, Mac-OS and Linux. RAS-SMS uses your mobile phone instead of smart cards, RSA keys or USB tokens.
This project focuses on bringing commercial quality L2TP support to Linux and possibly other Unixes. L2TP stands for Layer 2 Tunneling Protocol. It is a VPN similar to PPTP and a number of others. L2TP often competes with PPPoE.