This software uses the following open source projects: 

1. Excalidraw (https://github.com/excalidraw/excalidraw) 

Copyright (c) 2020 Excalidraw 

Permission is hereby granted under MIT License 

2. Tiptap (https://github.com/ueberdosis/tiptap) 

Copyright (c) 2019 Tiptap 

Permission is hereby granted under MIT License 

3. Simple Mind Map (https://github.com/wanglin2/mind-map) 

Copyright (c) 2021 Wang Lin 

Permission is hereby granted under MIT License 

All of the above projects are used under the MIT License. 

The complete MIT License text can be viewed at: https://opensource.org/licenses/MIT