There is a tool that was presented here, that looks like Ayoa: Octopus. Source: 12 months ago

Hi! I would just like to let you know that the IOctopus mind maps have made it possible to get free access for teachers, students and other educators. So if you are in education and have been looking for a awesome free online service, welcome you to try it! https://ioctopus.online/. Source: about 1 year ago

Hi, IOctopus has a free plan, it is nice service and allows you to share links to the map, embed an interactive map on your website and there is export to images. Source: over 2 years ago

Hi, check out IOctopus.online. It works on all devices, as it is an online service. There is a free plan, and there are inexpensive paid extended versions. Source: over 2 years ago

Try IOctopus https://ioctopus.online/ , it has flexible organic branches-tentacles, maybe what you're looking for. Source: over 2 years ago

In our project, the change in question affected sixteen content types. Our method of documenting the content model using Mind Map diagrams in Miro meant that we could easily identify the types in question and their elements and codenames. So all we needed was a simple array of content type codenames. - Source: dev.to / about 2 years ago

In the last 24hrs I came across Mind Map, and I’m already mapping out everything that happened and every little story just waiting to be resolved. So far the service appears to be free and I really could not be happier with it. Source: about 2 years ago

Looks like miro (https://miro.com/mind-map/). Caught my eye too, looks very clean and straightforward. Source: about 3 years ago