Speaking of S3 compatible file storage, I had found LeoFS. I noticed it has a distributed architecture, erasure coding support, and most interestingly, NFS support, multi-dc replication, extensive monitoring, and looks like has been in production for a while.<p><a href="http://leo-project.net/leofs/" rel="nofollow">http://leo-project.net/leofs/</a><p>NFS support could be a game changer, like say allowing researchers or some departments just access files in a directory and use whatever tools they find are easier (ipython, machine learning etc) not having to know about S3.
The other pithos project that I thought of from the title: <a href="https://pithos.github.io/" rel="nofollow">https://pithos.github.io/</a>