Open Source Software
Apache Accumulo
Apache Accumulo is a free and open-source sorted, distributed key/value store that provides robust, scalable data storage and retrieval. With Apache Accumulo, you can store and manage large data sets across a cluster. Under the hood, Apache Accumulo uses Apache Hadoop's HDFS to store data and Apache ZooKeeper as a consensus mechanism. Apache Accumulo is developed and released as open source software under the Apache License 2.0.
DragonFly BSD
DragonFly belongs to the same class of operating systems as other BSD-derived systems and Linux.
OpenBSD
FREE, multi-platform 4.4BSD-based UNIX-like operating system
NetBSD
PowerPC, Alpha, SPARC, MIPS, SH3, ARM, amd64, i386, m68k, VAX: Of course it runs NetBSD.
NetBSD Default Light Desktop
Electronics, Computer, Single Board Computer, Operating System, Raspberry Pi, ARM, Unix, Productivity, Sysadmin, Mac, OS, and BSD