Dia Canvas is a library for constructing custom graphical editors derived from the Dia application. Dia Canvas 1 is the original from Dia. Dia Canvas 2 is based on the Gnome Canvas (and libart).
g2 is a portable device independent graphics library.
libart is the anti-aliased rendering library for the GNOME canvas.
libplot is the library portion of plotutils.
piddle (developers distribution already renamed sping) is a graphics library for python.
vector-agg is a platform-independent library for rendering anti-aliased alpha-transparent vector graphics
XFree86 (X Windows) contains the Xlib library, which among other things, is a graphics library too.
C++ graphics library.