Tunnelblick is not available for Windows but there are some alternatives that runs on Windows with similar functionality. The best Windows alternative is OpenVPN, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Tunnelblick and ten of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Tunnelblick are WireGuard (Free, Open Source), SoftEther VPN (Free, Open Source), Viscosity (Paid) and OpenConnect GUI (Free, Open Source).
WireGuard is an extremely simple yet fast and modern VPN that utilizes state-of-the-art cryptography. It aims to be faster, simpler, leaner, and more useful than IPSec, while avoiding the massive headache. It intends to be considerably more performant than OpenVPN.
tunXten is a lightweight but powerful OpenVPN GUI client for the Windows platform. It takes OpenVPN usability to the next level by providing intuitive, easy to use way to handle an unlimited number of OpenVPN configurations.
OpenVPN Manager is a tool which controls OpenVPN. It is written in C# and uses the management interface of OpenVPN to control connections. Use the smart card feature in a simple way, enter passwords, monitor the OpenVPN log etc.