Another drawing editor for LaTeX with PSTricks & TikZ
jPicEdt is an extensible internationalized vector-based drawing editor for LaTeX and related packages (TikZ, PsTricks,...), written in Java. It is also a library of reusable high-level graphic primitives.
Papyrus is a C++ scenegraph (canvas) library that uses cairo/cairomm for drawing operations. This allows papyrus to be used to draw in a Gtk+/Gtkmm widget, or draw to png, pdf and ps surfaces. In concept it is similar to the Gnome canvas or QT canvas.
µSprite is a vector graphics editor for ActionScript 3 and haXe written in AS3. It generates AS3/haXe while it is being drawn and parses saved scripts so drawing can continue anytime. It implements multiple layers, masks, tween and path based animation.
OriSVG attends to give some help to origami diagrams designers by providing markers, arrows, strokes and preformated diagrams in SVG language, and some Inkscape's plugins and scripts.
PLOT_PSXPS provides a set of graphic functions that allows the
generation of PostScript files (and runtime viewing with X) from C/C++
programs. A page can contain points, lines, arcs, ellipses, circles,
boxes, text, included EPS files and a lot more.