Modest Grid is a super lightweight grid system developed to create responsive websites. The CSS is super light in weight.
What really sets Modest Grid apart are its naming conventions for the column classes it uses. As well as the ability to choose how many columns you would like to use (up to 24) as well as setting the gutter width of the grid.
Modest Grid came about from talking to the designers I work with and asking them things they would like to see when we develop their designs. They often felt that they were stuck using 12 column grid systems as some developers they worked with would only use grid systems such as Bootstrap and not change it to meet the designers needs; never mind the clients.
I feel Modest Grid offers an easier way for developers to change the number of columns and gutter widths the project requires right from the start.