sheetz

Read and write Excel (.xlsx,.xls), CSV, and ODS files in Java with one line of code. Annotation-based mapping, SAX streaming, built-in validation, 19 type converters, cell styling. A high-performance alternative to Apache POI. Maintained by chitralabs on GitHub, where it has earned 105 stars from the community.

It's actively developed around annotation, apache-poi, csv, and is a solid reference for anyone building with these tools.