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  2. IBM Workload Simulator for z/OS and OS/390
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Alternatives · 2026

The best IBM Workload Simulator for z/OS and OS/390 alternatives

The rest of Best Mainframe Testing Tools, in this site's order: each with what it costs, where it runs and its record score.

1
ACCELQ

ACCELQ suits teams managing automated and manual testing across web, mobile, and API products.

AndroidiPhone & iPadWeb+5 Free plan Record5.5 Visit
2
Galasa
WindowsMacLinux Free plan Record3.2 Visit
3
IBM Test Accelerator for Z
WebWindowsMac+1 — Record2.8 Visit
4
IBM Z Unit Test
Windows — Record2.3 Visit
5
Rocket SmartTest
— Record2.3 Visit
6
Infotel Application Parallel Testing
— Record2.1 Visit