CNTLM is described as 'Cntlm - Fast NTLM authentication proxy accelerator with tunneling, written in pure C'. There are three alternatives to CNTLM for Windows, Linux, Mac and Chrome OS. The best alternative is WinFoom, which is both free and Open Source. Other great apps like CNTLM are Px proxy (Free, Open Source) and Corporate Proxy Helper (Paid).
Winfoom is a HTTP(s) proxy server facade that allows applications to authenticate through a NTML/Kerberos/SOCKS/PAC file authenticated proxy server, typically used in corporate environments, without having to deal with the actual handshake.
Px is a HTTP(s) proxy server that allows applications to authenticate through an NTLM or Kerberos proxy server, typically used in corporate deployments, without having to deal with the actual handshake.
Enable any application to authenticate through a proxy server with NTLM or PAC proxy scripts with ease! Say goodbye to hours lost in corporate environments trying to get the proxy and SSL configuration correctly. Best alternative to CNTLM!.