MAC Address Changer
Technitium MAC Address Changer (TMAC) is a popular freeware utility to change or spoof MAC address of wired or wi-fi network adapters for Windows.
Apart from changing MAC address, you can use the feature rich software to completely configure your network adapter and also has presets feature to allow quick switching between multiple network configurations.
Technitium Bit Chat is a secure, peer-to-peer (p2p), open source instant messenger designed to provide end-to-end encryption. It can be used for messaging over the Internet as well as private LAN networks.
The software relies on strong cryptography using DHE-2048, ECDHE-256, RSA-4096 and AES-256 algorithms for encryption and authentication. The instant messenger is written c# and is currently available for Windows and Linux with Mono framework.
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