GameMaker heavily using Dear ImGui in their new update https://gamemaker.io/en/blog/release-2023-8

https://cdn.masto.host/mastodongamedevplace/media_attachments/files/111/024/538/836/119/687/original/13cd42516ece41cb.png

https://cdn.masto.host/mastodongamedevplace/media_attachments/files/111/024/539/111/761/666/original/87ffc27e2301cc1c.png