Hey all, I released ActuarialPlayground.com : an interactive and visual actuarial cashflow model, where the calculations are described by calculang. There is a 7min video where I use the Playground to explore some things here: I made remarks about the calculang model and especially model composition, that you can read under the '❓' tab calculang outputs a JS bundle you can see under '🌟' - obviously a lot can be done with it in a pretty familiar way This is a contrast to calculations rigidly defined in specialised tools, without composition, and without being able to break out or integrate in a tight visual/interactive and exploratory loop