The Aquamacs Project (http://aquamacs.org) has released Aquamacs 2.0, an update of the Mac-friendly variant of the Emacs editor Emacs. It’s a free editor for source code, web pages, typesetting documents and all other forms of text.
Aquamacs is optimized for Mac user interface conventions. Version 2.0 is now fully based on Cocoa, supports 64-bit computing on Macs and allows for better integration of applications with the operating system and other applications. It also offers improved dialogs for opening, saving, and printing files, configuring fonts and colors, and displaying user messages.
Text display is now fully based on Unicode. Aquamacs 2.0 also sports: more consistency and configurability in key bindings; improvements in the configurability of toolbars; updates in major included Emacs editing modes, including Python, Ruby, ESS, LaTeX/AucTeX, and more
Aquamacs is open source software. It’s Universal Binary so runs natively on both PowerPC and Intel Macs. Aquamacs 2.0 requires Mac OS X 10.5.8 or later.