Here are some few links and site with valuable working information.

The CentOS Project is a community-driven free software effort focused on delivering a robust open source ecosystem around a Linux platform. visit site

PuTTY is an SSH and telnet client. PuTTY is open source software that is available with source code and is developed and supported by a group of volunteers. visit site

Ubuntu is a free and open-source Linux distribution based on Debian. Ubuntu editions, Desktop, Server, and Core, can run on the computer alone, or in a virtual machine. visit site

node Postgres connection sample –