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file-system-access
Expose the file system on the user’s device, so Web apps can interoperate with the user’s native applications.
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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.
I don't know a C++ equivalent of HTML , prompt(), or File System Access API (https://wicg.github.io/file-system-access/; https://web.dev/file-system-access/) using JavaScript in the browser window.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.