Keso is an editor for scores and orchestras. Or, more precisely, a tracker-like GUI for the powerful softsynth Csound. It lets the user write music in patterns, and arrange those patterns in sequences. It will produce orchestra and score files that can be played or rendered by Csound. The user interface consists of different editors. Each editor is a plugin that can be removed or replaced, and new editors can be added while the program is running.
MIDI Controller is a small program that lets you set MIDI controller values using sliders and buttons in a GTK+ window. The GUI is an XML-based Glade file which can be replaced without rebuilding the program, so you can build your own controller GUIs in Glade, with any number of control widgets in any layout you want.
NPGPX is a Netscape plugin that can display routes, tracks, and waypoints from a GPX file. GPX (GPS eXchange) is an interchange format for GPS data. You can publish your GPS data online, and other people can use this plugin to view the data. It supports zooming and panning. The plugin is written primarily for Firefox on GNU/Linux, but it should work with other browsers that support Netscape plugins. It may or may not work on other operating systems.
GLASHCtl is a simple applet for controlling the LASH Audio Session Handler. When you run it, it will appear as a small LASH icon in your "notification area" or "system tray" (if your desktop manager is compatible with freedesktop.org's "System tray" standard). This is typically somewhere in the panel in KDE or GNOME.
AZR3-JACK is a port of the free VST plugin AZR-3. It is a tonewheel organ with drawbars, distortion and rotating speakers. The original was written by Rumpelrausch Tšips. The organ has three sections, two polyphonic with 9 drawbars each and one monophonic bass section with 5 drawbars. The two polyphonic sections respond to events on MIDI channel 1 and 2, and an optional keyboard split function makes the bass section listen to the lower keys on channel 1. The three sections have separate sustain and percussion switches as well as separate volume controls, and the two polyphonic sections have separate vibrato settings. All three sections are mixed and sent through the distortion effect and the rotating speakers simulator, where the modulation wheel can be used to switch between fast and slow rotation, and the fast and slow rotation speeds themselves can be changed separately for the lower and upper frequencies.
ll-plugins is a small collection of LV2 plugins and a host that runs them. All plugins are installed in separate LV2 bundles (except the ones that are closely related, like the math-constant plugins or the mono and stereo versions of the peak meter). The GUIs, for the plugins that have GUIs, are installed in bundles of their own to make it easier for packagers to put them in separate binary packages to avoid Gtk dependencies for the plugins themselves. There are synths, event processors, simple audio and control manipulators and GUI-based plugins.