Simple Grid is described as 'CSS grid for your website' and is an app in the Development category. There are more than 50 alternatives to Simple Grid for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Mac, Windows and Linux. The best alternative is Bootstrap, which is both free and Open Source. Other great apps like Simple Grid are Bulma (Free, Open Source), Materialize (Free, Open Source), UIkit (Free, Open Source) and Semantic UI (Free, Open Source).
960 grid system with 12 columns for Responsive Web Design. PSD file which has the 960 grid setup for you based on 32px gutters/margins. Offsetting columns - if you need to position a column over by say 2 columns. Four main media queries: 1. browsers over 960px
Topcoat is a brand new open source CSS library designed to help developers build web apps with an emphasis on speed. It evolved from the Adobe design language developed for Brackets, Edge Reflow, and feedback from the PhoneGap app developer community.
This project's goal is to be able to create a fully accessible material design styled website using React Components and Sass. With the separation of styles in Sass instead of inline styles, it should hopefully be easy to create custom components with the existing styles.