FreeTextBox - FreeTextBox is the most-used free ASP.NET WYSIWYG HTML editor featured in open source and commercial projects.
Geany - Lightweight IDE for Linux and Windows
Froala Editor V2 - A beautiful modern WYSIWYG HTML text editor
BlueGriffon - An HTML editor based on Mozilla rendering engine.
Edtr.io - Intuitive WYSIWYG web editor, open source & fully adaptable.
Adobe Dreamweaver - Adobe Dreamweaver is a proprietary web development tool developed by Adobe Systems.