Best Mainframe Application Development Software for Java
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Compare the Top Mainframe Application Development Software that integrates with Java as of July 2026
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This a list of Mainframe Application Development software that integrates with Java. Use the filters on the left to add additional filters for products that have integrations with Java. View the products that work with Java in the table below.
What is Mainframe Application Development Software for Java?
Mainframe application development software provides tools and environments for building, testing, deploying, and maintaining applications that run on mainframe systems. These platforms support programming languages commonly used in enterprise mainframes, such as COBOL, PL/I, Assembler, and Java, while enabling integration with modern development workflows. The software often includes debugging, code editing, workload management, source control, and automated testing capabilities to improve developer productivity and application reliability. Many solutions integrate with DevOps pipelines, cloud platforms, and API frameworks to help organizations modernize legacy systems and connect them with newer technologies. By supporting high-performance, large-scale transaction processing and mission-critical workloads, mainframe application development software remains essential for industries such as banking, insurance, government, and telecommunications. Compare and read user reviews of the best Mainframe Application Development software for Java currently available using the table below. This list is updated regularly.
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Assembler Code Refactoring
Rocket Software
Rocket Assembler Code Refactoring is a specialized modernization solution that automatically restructures legacy Assembler code into structured pseudocode or modern languages such as COBOL, C, or Java without altering external behavior, enabling faster, lower-risk modernization and improved maintainability. Assembler code is notoriously dense, poorly documented, and supported by a shrinking pool of specialists, making maintenance slow, costly, and error-prone; this product addresses those challenges by delivering semantics-preserving, auditable transformations that reduce outages and secure modernization without sacrificing stability. Its fully automated core engine uses mathematically guaranteed logic equivalence to eliminate conversion risk, dramatically accelerating projects while ensuring that refactored outputs are semantically identical to the original code. -
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OpenFrame
TmaxSoft
OpenFrame from TmaxSoft is a comprehensive mainframe modernization and replatforming solution that enables organizations to migrate legacy mainframe applications and data to open systems such as Linux, Unix, Docker containers, or public cloud environments without modifying existing business logic, preserving core functionality while reducing total cost of ownership and avoiding risky rewrites. It delivers a future-oriented, standard three-tier architecture that improves performance, stability, flexibility, and scalability compared with traditional mainframes, with support for over 100K MIPS and increased processing capacity. OpenFrame uses advanced compiler technology and an integrated asset analysis environment (OF Manager) to automatically convert user interface logic, application logic, and data structures so applications run natively in open environments with minimal manual effort, enabling existing personnel and skill sets to be retained. -
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CodeTurn
Astadia
CodeTurn is Astadia’s automated mainframe code conversion product, built to automatically transform legacy source code into modern source code that is maintainable and 100% functionally equivalent to the original. It takes an application’s source code and converts it to functionally identical sources, ready to run in an alternative environment on the same platform or on a different platform altogether. Because the conversion and testing are fully automated, the outcome of the modernization project becomes highly predictable in terms of risks, costs, and duration. The migrated application is free of dependencies on proprietary Astadia software and relies on native industry-standard technologies instead. CodeTurn integrates all aspects of conversion to produce high-quality, functionally equivalent code and is typically used with Astadia tools such as DataTurn for legacy data migration, TestMatch for automated testing, and DataMatch for automated batch testing.
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