It's made with React, but I tried to squeeze maximum performance (limited by my skills and desire to keep it somewhat readable, though) out of it. UI/UX was a big priority for me in this project, so I also tried to streamline it as much as possible and make Anori a joy to use. If you decide to try it, let me know how good I did!
Oh, and it's open source [1] and the process of adding new widgets is documented [2], so you can make your own!
[1]: https://github.com/OlegWock/anori
[2]: https://github.com/OlegWock/anori/blob/master/DEVELOPMENT_AN...