When you looking for software, you should install first the N9 RepoMirror explained in some link you posted.

And on openrepos you can select an application category then a drop down box appears there you could select the application platform to harmattan_app. Then the application get filtered and you could choose some which you would like to try.

You could find also application for the N9(N950) at some russian side.

https://allnokia.ru/symbsoft/n9/

You could find some apps here not all are available.
http://n9-apps.com/

But you could also use some old ovi links with archive.org.
Here an example:

1. you need to find old links
https://nokiapoweruser.com/widget-ru...t-nokia-store/

Widget manager would be https://store.ovi.com/content/302071
2. Paste the link into archive.org and add /download.

https://web.archive.org/web/*/http:/...08669/download

In 2015 I think most files got saved. In this year you will see a green dot with a number. Click on it then it will come a redirect message, which looks like an error wait some time and the download should start.