I have a list of editors which i have got from wikipedia
Alleycode HTML Editor — Freeware editor with syntax highlighting for both php and html.
CodeLobster - Free PHP IDE
ConTEXT — Freeware editor with syntax highlighting.
Crimson Editor — Lightweight editor. Supports FTP.
Dev-PHP IDE — Lightweight IDE. Supports FTP & SFTP, CVS & SVN, Multiple languages with highlighters, Xdebug, etc.
EditPad Lite - A freeware and simple editor with auto text indent.
Gizmo Editor - Freeware editor with syntax highlighting for PHP, HTML, CSS, Java, and much more.
HAPedit - A free PHP Editor with intellisense support
HTML-Kit — Syntax highlighting, Supports FTP.
Intype — Lightweight editor. Alpha version.
Notepad2 — Simple editor with syntax highlighting
Notepad++ — Supports FTP & SFTP via plugin; syntax highlighting.
NoteTab — Broad editor, allows you to have multiple tabs open for different files, has FTP support, comes in two trial versions (NoteTab Standard, NoteTab Pro) and one free version NoteTab Light. NoteTab Pro highlights tags.
PHP Expert Editor
PHP Tools for Visual Studio - PHP syntax highlighting, real-time checking of syntax errors, code outlining and navigation features for Visual Studio 2010 and VS11.
PSPad — Supports FTP; syntax highlighting.
Rapid PHP - Not free but has 30 day trial