https://www.textcontrol.com/product/tx-text-control-express/
TX Text Control Express - RichTextBox Replacement - Powerful Rich Edit Control for Windows Forms
Download TX Text Control Express, the free edition for private and non-commercial use. Enhance your Windows Forms applications with advanced word processing...
for windowstxtextcontrolexpress
https://learn.microsoft.com/en-us/dotnet/desktop/winforms/
Windows Forms for .NET documentation | Microsoft Learn
Learn about using Windows Forms, an open-source, graphical user interface for Windows, on .NET.
windows formsmicrosoft learndocumentation
https://www.perpetuumsoft.com/Home.aspx?lang=en
Windows Forms, ASP.NET, Silverlight Reporting, Charting, Gauge and OLAP Components for VS.NET
windows formsaspsilverlightreportingcharting