xkeycaps
manipulate X11 keymaps (for xmodmap) graphically
xkeycaps is a graphical front-end to xmodmap(1). It opens a window that looks
like a keyboard; moving the mouse over a key shows what KeySyms and Modifier
bits that key generates. Clicking on a key simulates KeyPress/KeyRelease
events on the window of your choice. It is possible to change the KeySyms
and Modifiers generated by a key through a mouse-based interface. This
program can also write an input file for xmodmap to recreate your changes in
future sessions.
xmakemol
program for visualizing atomic and molecular systems
XMakemol is a mouse-based program, written using the LessTif widget set, for
viewing and manipulating atomic and other chemical systems. It reads XYZ
input and renders atoms, bonds and hydrogen bonds.
xqf
X-based Quake Server Browser
XQF is a GTK+ frontend for Qstat, a tool for querying first-person
action game servers like Quake, Unreal Tournament, etc. It displays
information about the servers and allows configuring and launching some
of the games from it.
xscavenger
Lode-runner-like platform game for X
XScavenger is a platform game for the X Window System. From the README:
xshisen
Shisen-sho puzzle game for X11
XShisen is a puzzle game for X11. Similar to the famous "Shang-hai", your
objective is to remove all the pieces on the board.
xtrlock
Minimal X display lock program
xtrlock is a very minimal X display lock program, which uses nothing
except the Xlib library. It doesn't obscure the screen, it is
completely idle while the display is locked and you don't type at it,
and it doesn't do funny things to the X access control lists.