VPN operators are software or services that allow users to connect to a private or secure internet connection over a public network. They are widely used by individuals, businesses, and governments to secure communication, access, and data transfer.

1. OpenVPN: A popular open-source VPN that allows users to create their own VPN or use existing ones. It supports a wide range of protocols and is highly customizable.

2. PuTTY: A popular VPN operator that was acquired by OpenVPN. PuTTY offers a simple and user-friendly interface and is designed for Windows users.

3. TunnLink: A cloud-based VPN operator that provides secure communication for businesses and individuals. It offers a range of features, including multi-factor authentication and encryption.

4. Vpn Everywhere: A cloud-based VPN operator that allows users to create and use VPNs from any device. It supports a variety of protocols and offers advanced features like passwordless access.

5. VpnOptions: A popular cloud-based VPN operator that provides secure communication for both personal and professional use. It offers a range of features, including multi-factor authentication and encryption.

6. OpenVPN: Similar to OpenVPN, this is a popular open-source VPN that supports a wide range of protocols and is highly customizable.

7. PuTTY: A popular VPN operator that was acquired by OpenVPN. PuTTY offers a simple and user-friendly interface and is designed for Windows users.

8. TunnLink: A cloud-based VPN operator that provides secure communication for businesses and individuals. It offers a range of features, including multi-factor authentication and encryption.

9. Vpn Everywhere: A cloud-based VPN operator that allows users to create and use VPNs from any device. It supports a variety of protocols and offers advanced features like passwordless access.

10. VpnOptions: A popular cloud-based VPN operator that provides secure communication for both personal and professional use. It offers a range of features, including multi-factor authentication and encryption.

These VPN operators offer a range of features and use cases, so the best choice depends on your specific needs and preferences.