The past few weeks/months Steve Ruiz has been teasing a lot of the work he has been doing on tldraw, an app to draw diagrams.
— Steve Ruiz (@steveruizok) November 2, 2021
About two weeks ago he released it, and also made the source code available on GitHub. An extension for VS Code is also available.
Be sure to scroll through Steve’s timeline there, as the app is packed with fine details such as fixing the drift in shape rotations.