@Birthe I hope this is helpful:
You can find TiddlyResearch at https://github.com/postkevone/tiddlyresearch/blob/master/index.html. Download the index.html file and open it. It’s TiddlyResearch.
But you are right the link on Tiddlywiki.com is not working and needs an update.
The Drift Link is working.
Download the index.html file and open it. It’s Drift.
You can find Cardo at https://dyumnin.com/Cardo.html. The original http://cardo.wiki of it’s crator David Szego hasen’t been working for a while now. I wonder what happenend. He did an awesome job with Cardo. It is a favorite of mine and I am trying to update it, but ran into an Javascript Error with the 5.3.3. core. A problem I’m trying to solve with a little help of our community friends - hopefully. 