Most of the websites you get are blocked by ISP. So unless you switch the IP address using VPN network, there is no way to access them. In such case you'd be using VPN software on your desktop or browser to change your IP address. And once you do that and set the IP to another country, you can access most of the websites.
Here are some of the browser add-ons that you can use.
1. ZenMate - This VPN extension works on Opera, Chrome and Firefox. And you can set the IP to US, romania and few other countries. The paid version allows you to set any countries IP. And you can easily access the websites.
2. Dot VPN - This extension works similar to Zenmate but with limited features. You may also notice a bit slow server response in some cases too. But it can get the job done and you can view blocked websites easily.
3. GomVPN - GOM is a good Proxy service. It has both paid and free plans. You can use free plan for most of your normal browsing usage. And you can get most of the websites unblocked that are blocked by Indian ISP.
There are many other proxy unblocking add ons for browser. And there are some of the Windows based apps too. Depending on your requirement you can choose which option to go for the proxy server.