How to make a graphical vector task editor?

Question

Vector editor

I need to make a task editor with which you can edit tasks in the browser. The tasks themselves are simple. The sender of letters, the sender of SMS, the data source, for example, a table, a component of some mathematical operations, etc. It turns out a vector editor with dependency arrows. Are there any such editors ready for the web, the components themselves in JS? And what are such systems called in computer science, that is, the theory itself. I don't want to reinvent the wheel. Programming in C# ASP.NET and JS. The structure of dependences is especially not clear. I know that such systems are used in document management.

Answer 1

Task manager? Redmine, fat, trello.