This application is possible thanks to incredible open-source tools and libraries. Below are the required attributions for software distributed under the MIT License.
PeerJS
Peer-to-peer data, video, and audio calls made easy using WebRTC.
The MIT License (MIT)
Copyright (c) 2015 Michelle Bu and Eric Zhang
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies...
chess.js
A Javascript chess library for chess move generation/validation.
The MIT License (MIT)
Copyright (c) 2023 Jeff Hlywa (jhlywa@gmail.com)
Permission is hereby granted, free of charge, to any person obtaining a copy...
davidshimjs/qrcodejs
Cross-browser QRCode generator for javascript.
The MIT License (MIT)
Copyright (c) 2012 davidshimjs
Permission is hereby granted, free of charge, to any person obtaining a copy...
Audio (Public Domain)
Background Music: Gymnopédie No. 1 by Erik Satie.
Performed by Kevin MacLeod (incompetech.com). Standard public domain / Creative Commons attribution depending on the exact embedded Wikimedia asset.