Concordia is a tool for working with a rhythmic grid. In a nutshell, it is a type of grid for layout design where the size of blocks (grid cells) are aligned strictly and with preserved proportions to baseline and gutter width between blocks.
Current generator computes optimal rhythmic blocks for given grid configuration (max. width, aspect ratio, baseline, columns, gutter). The generator is based on derived modular arithmetic formula. The source code includes Matlab and JavaScript implementations with WebInterface as separate sub-project.