Drizzle
www.drizzle.org/content/product-description
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Drizzle is a community-driven open source project that is forked from the popular MySQL database.The Drizzle team has removed non-essential code, re-factored the remaining code and modernized the code base moving to C++.