A friend of mine built SMOS, an open-source terminal UI task manager similar to TaskWarrior, fully based on a tree editor (but IIRC not a DAG -- no merging): h

A friend of mine built SMOS, an open-source terminal UI task manager similar to TaskWarrior, fully based on a tree editor (but IIRC not a DAG -- no merging): https://smos.cs-syd.eu/features.html https://smos.cs-syd.eu/features.html In general I think that tree/DAG based task managers will become a lot more popular as more people need to organise more tasks.