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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
I've only had memory problems with apache poi. I only use https://github.com/dhatim/fastexcel now
If you're willing to pay for it, take a look at Aspose
Checkout Spreadsheet Builder DSL if you want an alternative and less verbose API for POI.
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.