This is a curated collection of notional machines, developed by ITiCSE 2020 Working Group 2 "Capturing and Characterising Notional Machines".
The background of this collection is described in the working group report:
To find out who is behind this site, check out the community page.
If you would like to contribute content, check out the information for contributors.
If you would like to further develop the site (e.g., provide new functionality, improve styling), check out the information for developers.