XBasic is a comprehensive program development environment that integrates a powerful editor, compiler, debugger, function libraries and GuiDesigner into a seamless working environment that encompasses the whole process of creating fast, efficient, reliable, portable 32-bit programs. XBasic is currently available for Linux and Windows 9x/NT.
Xcoral is a multi-window mouse-based text editor for Unix/X11 with syntax highlighting and auto-indentation. A built-in browser enables you to navigate through C functions, C++ and Java classes, methods, files, and attributes. This browser is very fast and self-updates automatically after file modifications. An ANSI C Interpreter (Smac) is also built-in to dynamically extend the editor's facilities (with user functions, keybindings, modes, etc).
XEmacs (formerly known as Lucid Emacs) is a powerful, extensible text editor with full GUI support, initially based on an early version of GNU Emacs 19 from the Free Software Foundation and since kept up to ate with recent versions of that product. XEmacs stems from a collaboration of Lucid, Inc. with Sun Microsystems, Inc. and the University of Illinois with additional support having been provided by Amdahl Corporation, INS Engineering Corporation, and a huge amount of volunteer effort.
XSLT-process is a minor mode for (X)Emacs that allows you to run a Java XSLT processor on a buffer and display the result in another buffer, or in a browser. You can also run the XSLT processor in debugging mode, setup breakpoints, run step by step, view local and global XSLT variables, and many more.
Xterminal is an Object Oriented User Interface with a client-server architecture. The main purpose is a friendly interface for the UNIX operating systems. It is designed to be used to build text-based applications in C++. It consists of a complete object oriented library including multiple, resizeable, overlapping windows, pull-down menus, dialog boxes, buttons, scroll bars, input lines, check boxes, radio buttons, etc. Mouse support, advanced object management, events handling, communications between objects are provided as well, bundled with a complete programmer's manual.
Xwpe is a programming environment with a user interface that mimics the Borland C and Pascal family of products. From within xwpe you can edit, compile, and debug programs. The xwpe-alpha project was an attempt to continue development and bug fixes for xwpe. Additional releases may occasionally occur, but major development has ceased.
gtex-letter attempts to deliver an easy alternative interface to LaTeX-letter. It is heavily configurable, and it supports multiple letter headers and default letter openings (which are configurable in the rc-file). Users can choose from three different levels of graphical interface complexity. Novice is easy to understand, while expert is straight-forward. There is also a non-interactive mode that makes production of standard-letters very fast. gtex-letter is implemented in Python and based on GNOME.