Scalable Processor Architecture (SPARC) is a RISC ISA that was originally developed by Sun Microsystems (now part of the Oracle corporation). The first implementation was used in Sun's own workstation and server systems. Later, it was licensed to multiple other manufacturers, one of them being Fujitsu. As Oracle terminated SPARC Design in 2017, all future development continued with Fujitsu as the main provider of SPARC servers.
Several fully open source implementations of SPARC architecture exist. Multiple operating systems are currently supporting it, including Oracle Solaris, Linux, and BSD systems, and multiple IoT malware families have dedicated modules for it as well.