ClipIt is a clipboard manager with features such as a history, search thereof, global hotkeys and clipboard item actions. It was forked from Parcellite and adds bugfixes and features.

The Assistive Technology Service Provider Interface, core components, is part of the GNOME accessibility project.

Dragon is a lightweight drag-and-drop source for X where you can run:

dragon file.tar.gz

to get a window with just that file in it, ready to be dragged where you need it. What if you need to drag into something? Using:

dragon --target

you get a window you can drag files and text into. Dropped items are printed to standard output.

Guile-RSVG wraps the RSVG library for Guile, allowing you to render SVG images onto Cairo surfaces.

Volctl is a PulseAudio-enabled tray icon volume control and OSD applet for graphical desktops. It's not meant to be an replacement for a full-featured mixer application. If you're looking for that check out the excellent pavucontrol.

ATKmm is the C++ binding for the ATK library.

GtkSourceView is a text widget that extends the standard GTK+ text widget GtkTextView. It improves GtkTextView by implementing syntax highlighting and other features typical of a source code editor.

Cairo provides Perl bindings for the vector graphics library cairo. It supports multiple output targets, including PNG, PDF and SVG. Cairo produces identical output on all those targets.

Pango is a library for laying out and rendering of text, with an emphasis on internationalization. Pango can be used anywhere that text layout is needed, though most of the work on Pango so far has been done in the context of the GTK+ widget toolkit. Pango forms the core of text and font handling for GTK+-2.x.

Murrine is a cairo-based GTK+ theming engine. It is named after the glass artworks done by Venicians glass blowers.

GTKmm is the official C++ interface for the popular GUI library GTK+. Highlights include typesafe callbacks, and a comprehensive set of widgets that are easily extensible via inheritance. You can create user interfaces either in code or with the Glade User Interface designer, using libglademm. There's extensive documentation, including API reference and a tutorial.

Cairo is a 2D graphics library with support for multiple output devices. Currently supported output targets include the X Window System (via both Xlib and XCB), Quartz, Win32, image buffers, PostScript, PDF, and SVG file output. Experimental backends include OpenGL, BeOS, OS/2, and DirectFB.

Pangox was a X backend to pango. It is now obsolete and no longer provided by recent pango releases. pangox-compat provides the functions which were removed.

GtkDoc is a tool used to extract API documentation from C-code like Doxygen, but handles documentation of GObject (including signals and properties) that makes it very suitable for GTK+ apps and libraries. It uses docbook for intermediate files and can produce html by default and pdf/man-pages with some extra work.

This package contains the standard GTK+ 2.x theming engines including Clearlooks, Crux, High Contrast, Industrial, LighthouseBlue, Metal, Mist, Redmond95 and ThinIce.

Graphene provides graphic types and their relative API; it does not deal with windowing system surfaces, drawing, scene graphs, or input.

Cairomm provides a C++ programming interface to the Cairo 2D graphics library.

GtkDatabox is a widget for live display of large amounts of fluctuating numerical data. It enables data presentation (for example, on linear or logarithmic scales, as dots or lines, with markers/labels) as well as user interaction (e.g. measuring distances).

Libdatrie is an implementation of double-array structure for representing trie. Trie is a kind of digital search tree.

This package provides a global menu applet for use with desktop panels such as mate-panel and xfce4-panel.

Pangomm provides a C++ programming interface to the Pango text rendering library.

Cairo::GObject registers Cairo's types with Glib's type systems, so that they can be used normally in signals and properties.

Pango is a library for laying out and rendering of text, with an emphasis on internationalization. Pango can be used anywhere that text layout is needed, though most of the work on Pango so far has been done in the context of the GTK+ widget toolkit. Pango forms the core of text and font handling for GTK+-2.x.

This program allows you to display GTK+ dialog boxes from command line or shell scripts. Example of how to use yad can be consulted at https://sourceforge.net/p/yad-dialog/wiki/browse_pages/.