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tatoeba2
Tatoeba is a platform whose purpose is to create a collaborative and open dataset of sentences and their translations.
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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.
They do have a lot of sentences with audio, but now that you mention it, I kinda wonder why they haven't added text-to-speech via the web speech API or similar. I filed a feature request, but who knows how they'll react :-)
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