Hello everyone !
You don't want to pay for host a nodebb forum ? You are at the right place !
I have created a list for you with free VPS hosting & Paas and what you will install for a good installation !
Let's start !

• Host1Free
  Host1Free is a free VPS hosting. Install debian and follow the guide for install nodebb on debian !
  Host1Free offers 128 MB ram and 256 SWAP with 10 MB/s for download and upload ! The servers are located in Germany, Africa and Latin America. Host1Free offers a dedicated IP.

• VPS.me
  VPS.me is a free VPS hosting. Install debian and follow the guide for install nodebb on debian !
  VPS.me offers 384 MB ram and 100 MB SWAP with 10 MB/s for download and upload ! The servers are located in United States. Unfortunately, VPS.me don't offer a dedicated IP, you are obliged to open ports in the panel.

• Cloud9
  You will find a guide on the docs nodebb : https://docs.nodebb.org/en/latest/installing/cloud/cloud9.html.

• OpenShift
  You will find a guide on the docs nodebb : https://docs.nodebb.org/en/latest/installing/cloud/openshift.html.

WOW !
I managed to install Nodebb on OpenShift !

@velderia I have managed : http://nodebb-129968.euw1.nitrousbox.com:4567
Details of the installation :

• RAM : 640 MB
• Region host : Europe
• Storage : 1000 MB

@psychobunny Ok. I will start the translation of the docs this afternoon because in UTC+2, it's 1H AM.