Public domain OS library (MVS version 3.8, VM/CMS release 6, DOS/VS release 34, TSS/370 version 3). ^ News Release (PDF), TurboHercules, 23 November 2010, archived from the original (PDF) on 10 March 2012. ^ Press Release, European Commission, 26 July 2010. ^ Exchange of letters between TurboHercules and IBM, Turbo Hercules, archived from the original on 12 October 2011. ^ Hercules goes commercial! (Web log), Oracle. ^ 'S/380 Description', MVS/380 project, Sourceforge. What operating systems can I run legally?', Frequently-Asked Questions, EU: Hercules 390 Version 3. ^ Approved licenses (alphabetical) (list), The Open Source Initiative. In September 2011, EC regulators closed their investigation without action. In November 2010, TurboHercules announced that it had received an investment from Microsoft Corporation. In March 2010, TurboHercules SAS filed a complaint with European Commission regulators, alleging that IBM infringed EU antitrust rules through its alleged tying of mainframe hardware to its mainframe operating system, and the EC opened a preliminary investigation. In July 2009, TurboHercules SAS asked IBM to license z/OS to its customers for use on systems sold by TurboHercules. In 2009, Roger Bowler founded TurboHercules SAS, based in France, to commercialize the Hercules technology. Certain unencumbered editors and utilities which can run on a mainframe without a parent operating system may be available to run on Hercules as well. Emulation of those specific z/VM features for OpenSolaris is included starting with Hercules Version 3.07. Sine Nomine Associates brought OpenSolaris to System z, relying on features provided by z/VM. Mainframe Linux distributions include SUSE Linux Enterprise Server, Red Hat Enterprise Linux, Debian GNU/Linux, CentOS, and Slackware. Several distributors provide 64-bit z/Architecture versions of Linux, and some also provide ESA/390-compatible versions. They run well on Hercules, and many Linux on IBM Z developers do their work using Hercules. There is no known legal restriction to running open-source operating systems Linux on IBM Z and OpenSolaris for System z on the Hercules emulator. The Michigan Terminal System (MTS) version 6.0A has been tailored to run under Hercules. However, a complete demonstration version of MUSIC/SP, packaged with the alternative Sim390 mainframe emulator, is available. 
Some of MUSIC/SP's features, notably networking, require z/VM (and thus an IBM license). The MUSIC/SP operating system may be available for educational and demonstration purposes upon request to its copyright holder, McGill University.
Older IBM operating systems including OS/360, DOS/360, DOS/VS, MVS, VM/370, and TSS/370 which are either public domain or 'copyrighted software provided without charge.'.
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