Windows application for PPTP, L2TP and OpenVPN

We need a Windows application to manage PPTP, L2TP and OpenVPN for existing vpn services. The application needs to communicate with an existing API server that will provide XML responses for user authentication, and server list for logged in user. User will need to be able to login to the application and to see a list of available servers and protocols. Application needs to work on Windows XP -> 8 and to be able to login on any provided PPTP, L2TP (IPsec/PSK) and OpenVPN. For OpenVPN, application or provided installer needs to be able to install TUN/TAP drivers. It is very important for me to receive a bug free application, so make sure you are good at testing. Please send me your similar work along with your bid.