I was surprised at the lack of any simple or straightforward libraries to create flowcharts in JavaScript, so I made my own. It's very easy to implement, and it has all the basic functionality - drag, drop, rearrange, and delete. I also included a demo of a marketing automation tool (similar to Zapier, but with flowcharts) made using the engine. Hope you find it useful!
looks nice! great work! I noticed I couldn't get parallel actions to return to a single node, that might be useful that have.
I kept it to a single "tree" so I could implement a simple mechanic to delete blocks - dragging and dropping them anywhere in the canvas. I also would have to take into account blocks overlapping (unless I automatically spaced them out), so at least for this release I didn't add that feature. It could definitely be implemented though :)
I'm impressed - I would have found this useful many times and I really like the appearance and simplicity. This looks like high quality work.