Driving the Future of Mainframe Innovation

Why 21CS
Products
- Our Products
  - SENTINELⁿ
    Comprehensive change management tool for z/OS
  - STRATUSⁿ
    Cloud object storage for z/OS | 21CS
  - Tape/Assist®
    Seamlessly migrates z/OS tape data
  - TRANSVERSEⁿ
    End-to-end, non-disruptive z/OS data migration
  - VECTORⁿ
    Modern, simplified dataset transfers
  - VSEⁿ
    Enhanced VSE experience compatible with previous versions
- What's Next
  - VERIFIⁿ
    Modern, adaptable JCL checker
  - OPTIMAⁿ
    The next generation of mainframe performance analytics
- Trusted IBM Partner
  - IBM Product Portfolio
- 21CS Partners
  - Global Partnerships
VSEn on IBM z17: The Only VSE Operating System Ready for What's Next

IBM z17 is here - and only VSEn 6.3 and 6.4 support it. Learn what this means for your VSE ...
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Solutions
- Our Solutions
Talk to a Mainframe Expert

Partner with experts who understand mainframe challenges and opportunities.
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Insights

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VSEn on IBM z17: The Only VSE Operating System Ready for What's Next
IBM z17 is here. For organizations running VSE workloads, the path forward runs through one operating system: 21CS VSEn 6.3 and 6.4.

IBM Z
July 22, 2026
Introducing New UI for STRATUSn
Why Object Storage?

z/OS Modernization
July 20, 2026
AI for QA with Python and ZOAU for the Seasoned Professional
I've recently started to use AI in my day-to-day work. Initially being a 'seasoned professional' - or just someone who has been working with mainframes for 45 years - I thought I'd skip the whole AI...

Mainframe Automation
July 15, 2026
21CS Establishes Strategic Partnership with TES Enterprise Solutions
MOREHEAD CITY, NC (July 14, 2026) - 21st Century Software Technologies, Inc. (21CS) announces a new strategic reseller partnership with TES Enterprise Solutions. Based in the United Kingdom, TES is...

Global Partnership
July 14, 2026
Rethinking Performance Management on IBM Z in the Age of AI
By Josh Stiles, Product Lead, 21st Century Software

Real Time Performance & Cost Control
July 2, 2026
21CS Announces OPTIMAn
The IBM Z Intelligence Gap Is Closing For decades, mainframe teams have been trapped in the same cycle: pull reports, wait for answers, make decisions on data that's already aging. The platform is...

Mainframe AI Integration
July 1, 2026
21CS Establishes Strategic Partnership with Interskill Learning
MOREHEAD CITY, NC (April 8th, 2026) - 21st Century Software Technologies, Inc. (21CS) announces a new strategic partnership with Interskill Learning, a global leader in IBM Z mainframe workforce...

News
April 8, 2026
21CS Earns 2026 Great Place To Work® Certification
MOREHEAD CITY, NC (March 31st, 2026) - 21st Century Software Technologies, Inc. (21CS) has been Certified™ by Great Place To Work® in the U.S., a recognition based entirely on feedback from current...

News
March 31, 2026

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