Technitium

Technitium MAC Address Changer (TMAC) is a freeware utility to instantly change or spoof MAC Address of any network card (NIC). Technitium Bit Chat is a secure, peer-to-peer, open source instant messenger that is designed to provide end-to-end encryption for privacy using strong cryptography. The software relies on strong cryptography using DHE-2048, ECDHE-256, RSA-2048 and AES-256 algorithms for encryption and authentication.