Legacy System Modernization

Fresche provides modernization, cloud, application-managed, and data services for IBM i and Microsoft systems. Its public materials describe AI-powered code and application modernization, custom web application development, database modernization, and ongoing application support.

Appeon's PowerServer is part of its PowerBuilder CloudPro offering. It automatically deploys a client/server PowerBuilder application as an installable cloud application backed by REST APIs running on .NET Core, while retaining the PowerBuilder development model.

VBUC (Visual Basic Upgrade Companion) is a commercial, licensed tool that converts VB6 source code to C#, VB.NET, or Blazor, including mapping the data-access layer (ADO/DAO) to Entity Framework Core and remapping third-party library calls as part of the conversion. The product predates its current owner: it was long developed and sold by Mobilize.Net, whose Application Migration Business Unit — including VBUC — was acquired by Growth Acceleration Partners (GAP) in a deal that closed in February 2023. GAP now sells it through its GAPVelocity.ai brand, where current marketing refers to it as the "VB6 AI Migrator," though the VBUC name persists in the product's documentation and license terms. Licensing is based on effective lines of code (ELOC) to be migrated, with a free tier limited to 10,000 lines.

OpenRewrite automates selected code changes through recipes. Its Java 8-to-17 guide documents API, dependency and build changes, alongside uncovered deprecations and build plugins that need manual updates. This is technical capability evidence, not proof of a completed customer migration. The guide describes the migration recipe module as source-available: compiled binaries are available to Moderne customers, while non-commercial users can compile it locally.

.NET Upgrade Assistant is a free, open-source Microsoft tool, distributed as a Visual Studio component and a standalone CLI, that scans a .NET Framework, .NET Core, or older .NET project for incompatibilities and walks a developer through upgrading project files, package references, and configuration to a current .NET version. Microsoft introduced it in 2021 under the dotnet GitHub organization, and it supports C# and Visual Basic projects including ASP.NET, WPF, WinForms, and Xamarin Forms. As of 2026, Microsoft has officially deprecated the tool in favor of the GitHub Copilot app modernization chat agent bundled with current Visual Studio releases; the legacy CLI still runs, but Microsoft is directing new upgrade work to the AI-based successor rather than continuing active development of Upgrade Assistant itself.

vFunction specializes in analyzing Java monoliths for microservices migration. Their platform uses runtime analysis and static code analysis to automatically identify domain boundaries and recommend decomposition strategies. It is built for Java modernization assessments.

The Software Revolution, Inc. (TSRI) specializes in automated modernization for mission-critical systems, particularly in defense and government. TSRI states that its JANUS Studio® achieves near 100% automation for less common languages such as Ada, Fortran, and Jovial, as well as standard COBOL.

Thoughtworks is a global technology consultancy headquartered in Chicago. It was taken private by Apax Funds in a transaction announced complete on November 13, 2024. Martin Fowler, who works at Thoughtworks, named and described the Strangler Fig pattern after watching colleagues modernize legacy systems gradually. Its published client work centres on re-architecture and incremental modernization.

SIG provides independent software quality assessments based on ISO 25010 standards. They benchmark code quality against industry standards and are frequently used for M&A technical due diligence, where they provide quality ratings for software portfolios.

SoftServe combines engineering services with industry verticals, particularly healthcare and retail. Its Adaptive Modernization Platform (SAMP) is a platform-as-a-service accelerator for building self-service platforms on AWS and Azure, aimed at platform engineering and cloud modernization rather than any single source technology.

N-iX is an Eastern European software engineering firm. It provides engineering talent for modernization projects, often at a lower price point than the major US/UK consultancies. Its work includes cloud and DevOps.

Modernizing Medicine specializes in healthcare legacy system assessment and modernization. It works with HIPAA compliance requirements and healthcare-specific legacy platforms (e.g., legacy EHR systems, patient management systems), which matters for healthcare organizations modernizing clinical applications.

Mobilize.Net no longer operates as an independent vendor. In January 2023 it agreed to sell its data business to Snowflake and its application migration business to Growth Acceleration Partners (GAP), and the Snowflake acquisition closed on February 10, 2023. Snowflake took the SnowConvert data migration tools and the BlackDiamond Studio developer tools. GAP took the WebMAP family of cloud-native application migration products, the Visual Basic Upgrade Companion (VBUC), the services teams, and the Mobilize.Net brand and website. The mobilize.net domain now redirects to GAPVelocity.ai.

Micro Focus was acquired by OpenText, which closed the deal on January 31, 2023. Its mainframe and COBOL tooling no longer sits with OpenText. On May 1, 2024, OpenText completed the sale of its Application Modernization and Connectivity (AMC) business, "formerly part of Micro Focus", to Rocket Software for $2.275 billion before adjustments. Rocket's announcement said it would offer COBOL and Enterprise Suite alongside host connectivity, application development and CORBA products.

Feathersoft provides legacy migration services with a focus on Visual Basic 6 (VB6) to .NET transformations. It offers migration factories and dedicated teams for upgrading legacy desktop applications.

EPAM is a software engineering services firm. Its modernization work goes beyond migrating code to re-engineering it into modern digital products, and its published modernization tooling includes the AI/RUN platform (AI-assisted migration and modernization on AWS) and KubeRocketCI, an open-source application delivery platform.

Embarcadero provides the tools and frameworks for Delphi and C++Builder development. They offer modernization strategies and tools to help organizations migrate legacy Delphi applications to modern platforms or update them to the latest Delphi versions.

Cognizant is ranked #1 in Application Modernization by HFS. Its "Skygrade" platform uses generative AI and modern tooling to accelerate cloud-native transformations, particularly in banking and healthcare.

Founded in 2012 with 49 engineers in New York City, Cleveroad delivers software for SaaS and FinTech companies. The firm handles product strategy through discovery and roadmap planning, then executes over multi-month sprints with transparent stakeholder reporting.

CAST provides automated code analysis and application intelligence. Their flagship product, CAST Highlight, scans entire application portfolios (100+ apps) to assess technical debt, cloud readiness, and security vulnerabilities, and is used for large-scale legacy assessments and M&A due diligence.

Accenture is a global professional services firm with a mainframe modernization practice. It combines strategic consulting with large-scale delivery and partnerships with the major cloud providers. Its "myNav" platform is used to chart migration paths.

10Clouds is a software house with a Warsaw address (Chmielna 73). Its homepage counts 17 years in business and currently positions the company around AI for banks, insurers and fintechs. It also lists React engineering and an AWS migration service.