zip_split
Break large zip or 7z archives and recompress all files one by one into their own zip For Linux and Mac (command line) It uses and embed moor libarchive wrapper https://github.com/castedmo/moor to ease the 7z reading and poco zip [https://pocoproject.org/index.html] to zip files. The ouput zipping is multihreaded via my favourites TBB library [https://github.com/oneapi-src/oneTBB].
It creates subdirectories every 1000 files zipped
Usage zip_split -i <Dir_with_bigzips> -o <Dir_to_store_res>
I used it to breakdown the ABC dataset[https://deep-geometry.github.io/abc-dataset/] into many (more than a million ) smaller individual zip files.