Answer the following question: Information: - XEmacs is a graphical- and console-based text editor which runs on almost any Unix-like operating system as well as Microsoft Windows. XEmacs is a fork, based on a version of GNU Emacs from the late 1980s. Any user can download, use, and modify XEmacs as free software available under the GNU General Public License version 2 or any later version. - The GNU General Public License (GNU GPL or GPL) is a widely used free software license, which guarantees end users the freedom to run, study, share and modify the software. The license was originally written by Richard Stallman of the Free Software Foundation (FSF) for the GNU Project, and grants the recipients of a computer program the rights of the Free Software Definition. The GPL is a copyleft license, which means that derivative work can only be distributed under the same license terms. This is in distinction to permissive free software licenses, of which the BSD licenses and the MIT License are widely used examples. GPL was the first copyleft license for general use. - Unix (trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, developed starting in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others. - Microsoft Windows (or simply Windows) is a metafamily of graphical operating systems developed, marketed, and sold by Microsoft. It consists of several families of operating systems, each of which cater to a certain sector of the computing industry with the OS typically associated with IBM PC compatible architecture. Active Windows families include Windows NT, Windows Embedded and Windows Phone; these may encompass subfamilies, e.g. Windows Embedded Compact (Windows CE) or Windows Server. Defunct Windows families include Windows 9x; Windows 10 Mobile is an active product, unrelated to the defunct family Windows Mobile. - Emacs and its derivatives are a family of text editors that are characterized by their extensibility. The manual for the most widely used variant, GNU Emacs, describes it as "the extensible, customizable, self-documenting, real-time display editor". Development of the first Emacs began in the mid-1970s and continues actively . - GNU is an operating system and an extensive collection of computer software. GNU is composed wholly of free software, most of which is licensed under the GNU Project's own GPL. - TeX (or , see below) is a typesetting system (or "formatting system") designed and mostly written by Donald Knuth and released in 1978. Together with the Metafont language for font description and the Computer Modern family of typefaces, TeX was designed with two main goals in mind: to allow anybody to produce high-quality books using minimal effort, and to provide a system that would give exactly the same results on all computers, at any point in time. TeX is free software, which has made it more accessible to a wider range of users. - AUCTeX is an extensible package for writing and formatting TeX files in Emacs and XEmacs . AUCTeX provides syntax highlighting , smart indentation and formatting , previews of mathematics and other elements directly in the editing buffer , smart folding of syntactical elements , macro and environment completion . It also supports the self - documenting . dtx format from the LaTeX project and , to a limited extent , ConTeXt and plain TeX . AUCTeX , originating from the '' tex - mode.el '' package of Emacs 16 , was created by students from Aalborg University Center ( now Aalborg University ) , hence the name AUCTeX . Lars Peter Fischer wrote the first functions to insert font macros and Danish characters back in 1986 . Per Abrahamsen wrote the functions to insert environments and sections , and to indent the text , as well as the outline minor mode in 1987 . Kresten Krab Thorup wrote the buffer handling and debugging functions , the macro completion , and much more , including much improved indentation and text formatting functions , and made the first public release of AUCTeX in 1991 . AUCTeX is distributed under the GNU General Public License . - GNU Emacs is the most popular and most ported Emacs text editor. It was created by GNU Project founder Richard Stallman. In common with other varieties of Emacs, GNU Emacs is extensible using a Turing complete programming language. GNU Emacs has been called "the most powerful text editor available today." With proper support from the underlying system, GNU Emacs is able to display files in multiple character sets, and has been able to simultaneously display most human languages since at least 1999. Throughout its history, GNU Emacs has been a central component of the GNU project, and a flagship of the free software movement. GNU Emacs is sometimes abbreviated as GNUMACS, especially to differentiate it from other EMACS variants. The tag line for GNU Emacs is "the extensible self-documenting text editor". - A text editor is a type of program used for editing plain text files. Such programs are sometimes known as "notepad" software, following the Microsoft Notepad. Given the paragraphs above, decide what entity has the relation 'developer' with 'gnu project'.
Answer:
auctex