If you are looking for a VPN service for your PC that is similar to HTTP Custom, there are a few options that you might want to consider. Here are a few VPN services that are similar in functionality to HTTP Custom and may meet your needs:
1. Shadowsocks: This is an open-source proxy application that allows you to bypass internet censorship and access blocked content. It works by creating an encrypted connection between your device and a remote server that you can use to access the internet. Shadowsocks is available for Windows, Mac, and Linux.
2. Psiphon: This is a free and open-source VPN service that allows you to access blocked content and websites. It encrypts your internet traffic and routes it through a series of servers to mask your location and bypass internet censorship. Psiphon is available for Windows, Mac, and Android.
3. OpenVPN: This is a popular open-source VPN protocol that you can use to create your own VPN server or connect to a third-party VPN service. It provides strong encryption and security features to protect your internet traffic and privacy. OpenVPN is available for Windows, Mac, and Linux.
4. SoftEther VPN: This is a free and open-source VPN software that allows you to create a VPN server or connect to a third-party VPN service. It provides strong encryption and security features to protect your internet traffic and privacy. SoftEther VPN is available for Windows, Mac, and Linux.
These are just a few examples of VPN services that are similar to HTTP Custom. You should research these and other options to find the one that best meets your needs.