Grid system is part of the Objective Typography and Design movement originated in Switzerland. However until 1981, some specialized design theory guide book was published - which is Grid Systems in Graphic Design. It has been selling like hot cakes since it came out (this has already been 36 years). It has been regarded as a visual design bible for graphics design, font layout and space design.
MarkMan (马克鳗) is a handy, very fast, smart and efficient labeling/marking app from China. It's a must-have design annotator for designers, reconstructors, front-end engineers on Windows, Mac OS X and Linux.