Beerwin's PlainHtml is a powerful HTML source editor with PHP toolbuttons, many JavaScript and HTML snippets and complete HTML, PHP, Javascript 1.3 and CGI reference. All this is completed with an Extender which offers the possibility of extending the main program.

Features
MDI
Integrated FTP client
Export to HTML, RTF and TEX
HTML Tidy
Interactive startpage
Word Wrap
Embedded code highlighting
Save/reload window lists (Save your opened documents' list and reload those documents by two clicks)

Single instance (PlainHTML is started only once)
Window list dialog (for faster document switching)

Full drag and drop support (accepts files dropped everywhere on it's window, text can be dragged&dropped between document windows)
Application-level Double edit protection (a document cannot be opened twice or more)
Integrated IE preview (With double screen support)
Configurable toolbars
Configurable editor
Preview from localhost
PHP error check (needs php and webserver installed)
HTML validation
Tag wizards
Built-in HTML templates (with update possibility - Extender)
Table layouts (with update possibility - Extender)
Code Snippets
References
Quick tag insertion from the Side Bar
Toolbuttons for most of HTML tags
Syntax Highlighting
Full entity list
Color picker with 5 color sets + Custom palette with save-reload function
Runs on Windows Vista