Update: Probably those plugins are kinda outdated today. I'm not a web frontend expert and tend to fallback to jQuery when I need to prototype something fast because it works for me.

Few years ago, for some work-related project, I wrote some jQuery plugins

• multi-list, turns an unordered list into a multiple selectable list (source, npm)
• chartjs-plugin-funnel-labels, plugin for Chart.js to add labels between columns to show the % progress in the same dataset. Version 2.6.0 or above required (source, npm)
• date-ranges-selector, selector for multiple date ranges (source, npm)