X-Bone dynamically deploys and manages Internet overlays to reduce their configuration effort and increase network component sharing. It discovers, configures, and monitors network resources to create overlays over existing IP networks. It uses two-layer IP-in-IP tunneled overlays and supports existing applications and unmodified routing, multicast, and DNS services in unmodified operating systems. X-Bone also support IPsec within overlays.
Xclasses is a C layout library for the X Window System. All objects (called gadgets) are font sensitive, i.e. their size changes with the size of the used screen font and the size of the window. All this is done by Xclasses itself. The user may choose any kind of font style and size.
XCmail is a MIME and multi POP3 capable mailtool for X11 using the Xclasses X11 layout library. Its main purpose is to read and write mail, allowing any kind of data to be attached. It can handle MIME types, has helpers to show different types, and can encode and decode binary data into ASCII to allow it to be transported as mail over the Internet. It has many built-in functions such as 2 vCards, unlimited POP3 servers, SMTP, SMTP after POP3, SMTP-AUTH (RFC2554), addressbook, encoders, filters, a special spam filter, spell checker, xface, and a new "virtual folder" concept. It also uses external programs to enhance its feature set. XCmail can be extended through a plugin interface.
XCounter is an X11-based traffic monitoring program for Linux that displays information about IP traffic on a selected interface. It returns such information as byte counts, time of current connection, and speed for the last 'n' seconds. It works on Ethernet, FDDI, ISDN, PLIP, and SLIP/PPP interfaces.
Xdobry is a form-generator for relational databases. It is aimed at people who want to create forms to an existing database or migrate databases. MySQL, Postgresql, sqlite, ODBC (MS Access, MS SQL Server), and Oracle are supported. The system contains SchemaEditor, FormEditor (GUI Drag&Drop Editor), and FormServer. Xdobry offers functions to manipulate, import, and export database schema. Xdobry lets you browse your database like hypertext documents. Xdobry can migrate data between all supported databases.
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.