Using third-party control libraries
There are not as many free or open-source third-party libraries for .NET MAUI as there are for Blazor. This is probably because creating Blazor components is easier. You only need to concern yourself with supporting one user interface target, the web. When building a .NET MAUI control library, you would want to implement each control for native iOS, Android, Windows, macOS, and hopefully Linux in the future. That is a lot of tricky work.
The only major component library software manufacturer that gives away a control library for .NET MAUI for free is DevExpress, and its library only supports the two mobile platforms, iOS and Android. It is also not open-source.
You can learn more about the DevExpress library at the following link: https://www.devexpress.com/maui/.
Other .NET MAUI component library software manufacturers charge license fees for their libraries, for example, Progress Telerik ($999 for a single developer license...