It's largely geospatial tools, which urschrei commented on above. Others are abstract, for example I use https://ignite.apache.org (I know I could use Redis), and that's one of the things tying me into the JVM. I use Apache Ignite as a distributed cache thingy.
I really want something in rust that can read orc files from hdfs and write them to some other database using jdbc or odbc. It's difficult though. So many technologies there from the Java world :(