Among those 3 free VPN services without any installation mentioned before, MacroVPN and ItsHidden are not available any more.
But luckily, there are always some new alternatives, and the following will show you a good one — Super Free VPN, which offers a free PPTP VPN service.
On the homepage of the website, you can get the all the information of the free PPTP VPN account instantly, as what you can see from the following image:
For how to use the above information to set up the Super Free VPN service, you can refer to what we do with Free VPN Servers, comparing to which, Super Free VPN will change the password every 8 hours, instead of just 30 minutes.
But if you are living in China, you maybe fail to set up the VPN service with the above information directly, since the "superfreevpn.com" domain is blocked by the GFW in China. While the domain is blocked, the IP isn't yet, so you can change the VPN server "superfreevpn.com" to the following IP address:
After that, you can set up the Super Free VPN service on your computer, mobile phone or tablet to get access to any blocked website in your country or area.
By the way, since the domain is blocked, you can't visit the "superfreevpn.com" website directly, but you can do that by using some other free VPN or Proxy tools.