SIXTH STEP: The fun begins

You can find these in Xpenology's app store and various docker images.
Prerequisites for you to know:
Port forward from your router

Media Centers & Managers - catalog, stream your media locally or remotely, automatic transcoding (convert to whatever video format your device/phone/tv can accept automagically while playing, very CPU intensive)
Plex - Most SMART TVs can download Plex from the TV's app store
This is mine

Emby - Similar to Plex, but can use GPU for transcoding
This is mine


Documents & Office
Office - Very similar to MS Office, runs in your browser. If you convert into it's own format, all opened browsers of the same document will get live editing, best for collaboration
Draw.io - Visio-like diagramming and technical drawing software


Book/Comic/Manga reader
Ubooquity - mostly for comics and manga

Calibre/Calibre Web - for your ebooks, magazines, etc

OS
Ubuntu - since Xpenology is linux based, we can also use docker version of ubuntu. Access the OS via browser.

DOCKER EXAMPLE
Basically, Docker is pretty cool, services/softwares are prebuilt, preinstalled with all the necessary configs and tools in an image. You download the image, create a container with that image, and access the image via ports (like http://yournasIP:portnumber). No need to install, configure this that and what you traditionally do before running the software. For example, if you wanna run a wordpress webserver, first you need to install the OS, then install the webserver, configure whatever, then install wordpress. With docker, download the wordpress image, and launch. That's it!

With xpenology, the GUI is pretty powerful, can do 99% of the time from the GUI itself. I'll show an example by installing draw.io.
1. From the package center, install Docker
2. Run docker, go to Registry, and search for draw.io. get the one with the most stars (the top one). If you want more info, click on the link next to the image name. Choose the latest version. We will need to consult the link for additional installation steps (if needed).

3. If you go to Image, you can see the download progress. Once it finishes, click Launch. Give it a name. Click Advanced Settings.
4. Go to Port Settings. From the image's docker hub page, we see that it uses port 8080 and 8443 (80 for http, 443 for https). You can change the Local Port to whatever you want/need. In my case, I already use 8080 for some other image, so I change it to 11080 and 11443.

5. Go to Advanced Settings and create a shortcut on desktop. point it to your NAS IP with the http port.

6. You're done! Turn on via Docker>Container or Xpenology Desktop icon.