Tkdraw is a very simple drawing tool, implemented as a wish script providing a thin user-interface layer on top of tk's canvas widget. It is fairly primitive, but it can be used for simple drawings, producing GIF images for web pages, simple one-page documents intended for fax or printout (ie, memos) and the like.
A vector drawing and graphics program based on the canvas widget of the tool command language Tcl/Tk, for drawing book quality figures, slide presentations, diagrams, and pictures.
Tubesock is a GTK/GNOME swf player released under the GPL. Currently the code right now is parsing SWF files, and can dump the contents, and can display some stuff. Tubesock is written 100% in c, and depends on glib2 and gtk2.
TundraDraw is a cross-platform ANSI/ASCII drawing program which features network connectivity to allow artists to draw together over the Internet. It also has a 24-bit color ANSi mode, as well as a VGA/SVGA preview window.
A simple but powerful drawing program, created for young children. It includes sound effects and Tux, the Linux Penguin, who gives you tips. Tux Paint is Open Source software created using the SDL library, and is available for Linux and Windows and in English, Spanish, French, German and Finnish.
UMLGraph allows the declarative specification and drawing of UML class and sequence diagrams. The current features are part of an ongoing effort aiming to provide support for all types UML diagrams.
Xfig is an interactive drawing tool which runs under X Window System Version 11 Release 4 (X11R4) or later, on most UNIX-compatible platforms. In xfig, figures may be drawn using objects such as circles, boxes, lines, spline curves, text, etc. It is also possible to import images in formats such as GIF, JPEG, EPSF (PostScript), etc. Those objects can be created, deleted, moved or modified. Attributes such as colors or line styles can be selected in various ways. For text, 35 fonts are available. Text can also include Latin-1 characters such as ``a umlaut'' or ``c cedilla''.