... Technical drawing is a very important application of computers. ... Search SAL: . CAD, Drawing Painting Tools ( Commercial, Shareware, GPL ) . ... AGD -- LEDA-based C++ library for automatic graph drawing. aiSee -- calculates a customizable layout of graphs specified in GDL. angela! -- a mouse-driven editor to help you creating graphs. ... Canvas -- vector drawing, technical illustration, image editing, etc. in one application. ... SAL Home | Computer Graphics, Images Signals . ...