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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 – https://node-postgres.com/features/connecting