The HDF 4.3.1 release is now available from the HDF 4.3.1 download page on the HDF Support Portal. For information on HDF4, see the HDF4 information page.
This is a minor release with several bug fixes related to memory issues and the hdp tool.
Please see the full release notes for detailed information regarding this release.
We maintain a release schedule in the README on Github. As always, feel free to post on the forum with any questions.