Aquamacs is based on the free GNU Emacs, put special emphasis on the Integration with Mac-typical behaviors, and one for Mac users appropriate GUI and operation.
In particular, supports Aquamacs Emacs all Fonts on the Mac, works according to the developers, great with Latex, and offers extensive Support for HTML, PDF, Tabs, and other functions. The new Version 2.0 is now based entirely in Cocoa and supports 64-Bit, brings a new Icon, has the dialogs for Open, Save, and Print improved and is based in the text completely to Unicode. Aquamacs 2.0 is Donationware - the developers ask for a donation and runs from the Mac OS X 10.5.8 (Universal Binary).
You can free download Aquamacs and safe install the latest trial or new full version for Windows 10 (x32, 64 bit) from the official site.