Cedvel is a prototype application for designing custom grid systems.
Featuring columns, gutters, a baseline grid and an overlay script to check your alignments.
Very comprehensive grid development app. Currently in beta but looks very promising.
Gridlover keeps sizing type tidy and logical. Font sizes are calculated by stepping up the font size by the scale factor. Elements in Gridlover are always kept aligned to a baseline grid.
A simple widget for your Mac OSX dashboard, which given any number, will calculate the corresponding value using the golden ratio.
Type in your numbers and get yourself a PSD, AI or PNG file.
A responsive grid system for fixed and fluid layouts. Built in SCSS, it gives you flexibility and full control. Profound indeed
CSS framework for professional developers: Minimal, adaptive and responsive. No imposed styles. There is also a developer version that includes LESS files with variables, mixins and modules.
Patterns, resources and news for creating responsive web experiences.
'Skeleton is a small collection of CSS files that can help you rapidly develop sites that look beautiful at any size'. Would like to see it scale bigger than 960 though.
For responsive/adaptive and non–responsive layouts, based on Compass.
Dig responsive design? Hate fluid grids? Try a Frameless grid. Their words, not ours.