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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
D3 is a JavaScript framework for data visualization. I've used it a bit a while back, even created Opal Ruby bindings, but that was many versions ago.
color manipulation functions
data fetching
data interpolation system
extra data structures like d3.set and d3.map
extra functionality for existing JavaScript arrays like max, mean, quantile etc.
generate random numbers from various distributions
geographical data handling system
jQuery-like data manipulation framework
parsers for formats like CSV
printf like formatting
scale system
timer management
visualization components for various types of data