On the Alidage homepage, you can click on the "猛击这里，探索真理" button, enter your email address, and press the Enter key, the you can get your free SSH tunnel account via email.
The password will be changed every one hour, then you will need to enter your email address again to get the new one.
The Onlybird website offers 2 different free SSH tunnel accounts, which you can see directly by clicking on the above link.
By the way, the password will be changed every 4 hours, and the server port is 9999, instead of the default 22.
BlueSSH offers one free SSH tunnel account, which you can see on the "免费 SSH" page.
The server port is 80 or 443, and the password will be changed every half an hour.
Usassh offers 2 free SSH severs, but the one with 22 port was not available now.
And the other one with port 80 or 443 will update its password every o'clock.
While the above 4 websites are all Chinese, the following one is English:
Sekian Dari Saya By: Achmad Syaichul Hadi
