Flexbox Grid is a library for creating grid layouts using the CSS flexbox property family. Use this tag whenever you have a question involving the use of the Flexbox Grid library. Flexbox Grid utilizes identical classes as Bootstrap, so conflicts may arise. It predates the CSS Grid module.
Flexbox Grid is a library that supports grid layouts based on the CSS Flexible Box Layout Module. It was created and released in 2013 (before CSS Grid layout spec was published by W3C).
Flexbox Grid library uses identical classes to Bootstrap, so there may be some compatibility issues if you use both libraries. It also utilizes Normalize CSS 2.1.3.
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