RefDB is a reference database and bibliography tool for SGML, XML, and LaTeX documents, sort of a Reference Manager or BibTeX for markup languages. It is portable and known to run on Linux, Free/NetBSD, OSX, Solaris, and Windows/Cygwin.
An Emacs major mode for editing PHP code. Features: Syntax coloring and indenting; Documentation browse and search functions; Support for Imenu and SpeedBar; Customization options; and support for language features from PHP 5.4 and beyond.
The latest release can be found at https://github.com/ejmr/php-mode and all bug reports should go there..
thine is an abbreviation for Thine Is Not Emacs. It is an Open Source text editor, developed using the Zend engine (used by PHP) as the scripting engine, instead of LISP which is used with Emacs. This means that customizing it will be incredibly easy.