Airframe React is a free open source high quality dashboard / admin / analytics template based on Bootstrap 4 & React. It works great on any smartphone, tablet or desktop.
Also jQuery version is available.
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Tabler is a premium, free and open source dashboard template with responsive and high quality UI. Tabler is built on Bootstrap.
Simpletooltip is a jQuery plugin, thought to insert short tooltips to any element of your website more easily.