Came across a reference to this in my bookmarks. The original was gone and before I go reliable snapshots of my bookmarks but I found at least a couple of interesting open source projects, like the linked one about and also https://pleiad.cl/tod/ which also has videos:
https://pleiad.cl/tod/screenshots.html
Does anyone on HN have experience with any of these or other similar tools? Why don't we hear about this anymore?
Edit: Probably bookmarked it based on this old HN thread: https://news.ycombinator.com/item?id=4801710