Gumby vs Primer: What are the differences?
Gumby: A Flexible, Responsive CSS Framework - Powered by Sass. Create rapid and logical page layout and app prototypes with a flexible and responsive grid system and UI kit; Primer: CSS toolkit and guidelines that power GitHub. Primer is the basecoat of GitHub, made by nerds just like you who share a passion for HTML and CSS.
Gumby and Primer can be primarily classified as "Front-End Frameworks" tools.
Gumby and Primer are both open source tools. Primer with 8.42K GitHub stars and 621 forks on GitHub appears to be more popular than Gumby with 2.95K GitHub stars and 479 GitHub forks.