Viscosity software (version 1.5.4) is a VPN client that enables s to connect to a variety of VPN protocols, including OpenVPN, PPTP, and L2TP/IPsec. The software offers advanced features such as DNS leak protection, IPv6 leak protection, and traffic obfuscation to enhance privacy and security. s can easily switch between VPN servers and customize connection settings, and the software also s split-tunneling and automatic connection on startup.