In this shortlist, here are some of the alternative third-party libraries to integrate Chromium Embedded Framework into a C# App.
CefSharp
WebView2
Introduction to Microsoft Edge WebView2 — Microsoft Edge Development | Microsoft Docs
GUI Webviews
Last but not least, you can also use the webviews supported by the GUI framework of your choice. But, most of the current webviews are not based on the Chromium web browser. So be careful, you may not get the exact results you want.