Mainframe Modernization
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COBOL · z/OS · Replatform · Refactor · Rehost

Mainframe Modernization Tools & Platforms

A curated 2026 directory of 24 platforms, tools and communities for modernizing mainframe and COBOL estates — from hyperscaler migration services and the mainframe vendors’ own tooling to refactoring specialists and open-source projects. For the AI-driven code-transformation tools, see AI-Augmented Code Modernization Tools.

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Rehost & Replatform

Move workloads to cloud or Linux runtimes

🔄

Refactor to Java/.NET

Convert COBOL into modern languages

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API Enablement

Expose z/OS data and transactions

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AI-Assisted Understanding

Explain, document and transform legacy code

Cloud Provider Mainframe Platforms

4 tools

Hyperscaler services that assess, refactor, replatform and rehost mainframe workloads on public cloud.

01Cloud Platform

AWS Mainframe Modernization

AWS service for moving mainframe workloads to the cloud with minimal business disruption, using either a refactoring or a replatforming pattern with managed runtime environments.

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02Cloud Platform

AWS Transform for Mainframe

Agentic AI service that reimagines mainframe applications as cloud-native systems, keeping business logic traceable back to the source code.

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Mainframe Platform & Tooling Vendors

7 tools

The vendors that build the mainframe stack itself, along with AI-assisted and API-based paths for evolving it in place.

06Vendor

IBM Z

IBM’s mainframe servers and software, the platform that most modernization programs either stay on, integrate with or move away from.

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07Vendor

IBM z/OS Connect

Software for designing and running OpenAPI-conformant APIs that expose z/OS applications and data to modern clients — the encapsulation path.

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08Vendor

Rocket Software Enterprise Suite

COBOL analysis, development and runtime tooling for replatforming mainframe applications. Rocket took over OpenText’s Application Modernization and Connectivity business, the former Micro Focus line.

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09Vendor

BMC AMI DevX

AI-augmented platform that unifies mainframe coding, testing and delivery, with generative AI that explains, refactors and converts mainframe code.

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10Vendor

Broadcom Mainframe DevOps

Mainframe DevOps and application-development tools that let teams use popular off-platform DevOps tools without disrupting existing workflows.

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11Vendor

Precisely Connect

Integrates data from legacy and mainframe systems into cloud and next-generation data platforms.

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Migration & Refactoring Specialists

5 tools

Independent vendors focused on converting, rehosting or re-creating mainframe applications on open platforms.

12Specialist

Heirloom Computing

Refactors IBM mainframe applications to Java for cloud-native deployment on any major cloud or on premises.

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13Specialist

Astadia

Mainframe-to-cloud migration and modernization services built around an automated migration factory for code conversion, data migration and testing.

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14Specialist

LzLabs

Software Defined Mainframe that runs existing mainframe applications on Linux and in the cloud without recompilation or data reformatting.

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15Specialist

Mechanical Orchard

AI-native modernization company whose Imogen platform re-creates legacy behavior from real data flows instead of translating the code.

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16Specialist

EvolveWare Intellisys

AI-enhanced platform for application assessment, business-rules extraction, documentation and migration of COBOL and other legacy code.

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Open-Source Mainframe Tooling

4 tools

Free tools for connecting to, testing and building on mainframe systems from modern developer environments.

17Open Source

Zowe

Open-source framework for using z/OS data and applications from modern applications and tools, under the Open Mainframe Project.

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18Open Source

COBOL Check

Unit-testing framework for COBOL applications, useful for pinning down behavior before and after a migration.

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19Open Source

Galasa

Open-source integration test framework for building and running automated tests against complex enterprise applications, including mainframe ones.

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20Open Source

GnuCOBOL

Free, open-source COBOL compiler for running and compiling COBOL programs on modern platforms.

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Communities, Training & News

4 tools

Where mainframe practitioners learn, compare notes and keep up with the market.

23Community

SHARE

Independent user association offering training, technical content and networking for IBM Z mainframe professionals.

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