Want the source code on Github?
The HDF5 source code is maintained in a github repository:
Looking for a specific release?
NOTE: Source code for Compression Filters used by HDF5 can be found here: ZLIB, AEC (open source SZIP), SZIP (replaced by AEC in HDF5-1.10.7)
See Release Specific Information for information on changes in a release.
HDF5 source code releases by version.