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Arca Noae

Arca Noae is a technology company that develops and supports OS/2-based operating systems, drivers, and software, including its flagship ArcaOS.

Last updated September 26, 2026

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Overview

Arca Noae, LLC is a technology company dedicated to maintaining and developing software, drivers, and services for the OS/2 operating system and its derivatives, such as ArcaOS and eComStation (eCS). Founded in July 2014 by several developers who had previously worked on the eComStation project, the company was created out of frustration with the lack of progress and commitment from the project's new owner. The result was a new, better-supported project initially called Blue Lion, which was ultimately released as ArcaOS. Arca Noae's flagship product is ArcaOS, an x86 operating system based on OS/2 Warp 4.52. ArcaOS is not merely a repackaged OS/2; it includes significant enhancements to address long-standing issues and ensure compatibility with modern hardware. It supports a wide range of applications, including 32-bit and 16-bit OS/2 applications, 16-bit Windows applications, DOS applications, ported Linux applications, select 32-bit Windows applications, Java applications, and Qt3, 4, 5, and 6 applications. ArcaOS 5.1 introduced the ability to boot from modern UEFI-based systems, with or without a Compatibility Support Module (CSM), and includes Secure Boot certificates, GPT disk layout support, and the ability to install to large SSDs. In addition to ArcaOS, Arca Noae offers an annual subscription package for OS/2 and eCS drivers and software, as well as third-party-developed drivers and software through its online store. The company provides services such as developing and maintaining device drivers, repackaging OS/2 software for alternative package managers (YUM/RPM), consulting on OS/2 deployment, maintenance, and upgrade strategies, and helping protect customer investment in OS/2. Arca Noae also acts as a gateway for sponsoring OS/2-focused non-profit and volunteer efforts, passing through 100% of contributions made through its online store. Arca Noae maintains close ties to the OS/2 community, sponsoring new development and engaging with users and systems administrators. Its principals and engineers regularly speak at OS/2-focused events and participate in online discussions. The company has a worldwide virtual and physical presence through a network of strategic and consulting partners, supporting enterprises of all sizes as well as individual users. Many enterprises rely on OS/2 for critical infrastructure operations and cannot risk losing such a vital piece of their technology; Arca Noae addresses this by providing expertise, hardware upgrade recommendations, and security solutions to bring OS/2 in line with modern data encryption standards and foster new web browser and networking technology. Arca Noae is a private company, owned by its managing members. Lewis Rosenthal is the Managing Member of Arca Noae, LLC, and has worked with OS/2 for many years. The company's founding principles include information security, and it applies these principles to its websites and online store. Arca Noae continues to support OS/2, eCS, and ArcaOS users, with the vast majority of net proceeds from sales reinvested into further development and support for the OS/2 platform.

History

Arca Noae, LLC was founded in July 2014 by several developers who had previously worked on the eComStation project. They felt that the future for the platform looked bleak due to lack of progress (or any work being done at all), demonstrating a distinct lack of commitment on the part of the project's new owner. The result was a new, better-supported project and product called Blue Lion, which was ultimately released as ArcaOS. IBM stopped supporting OS/2 at the end of 2006, but many companies and individuals continued to use OS/2, eCS, and later ArcaOS. Arca Noae was created to fill the void, focusing on maintaining and developing new and existing software, drivers, and services for OS/2 and its derivatives. The company works closely with the OS/2 community of private users, developers, and enterprises. ArcaOS, the flagship product, is an x86 operating system based on OS/2 Warp 4.52. It is targeted specifically at booting, installing, and running on modern PC hardware. ArcaOS has undergone significant enhancements to address long-outstanding issues with prior OS/2 distributions and to ensure compatibility with the widest range of modern hardware. Many portions of the OS have been completely rewritten to leverage the power and performance of modern PCs. ArcaOS 5.1 is the first ever release of an OS/2-based operating system with the ability to boot from modern UEFI-based systems, with or without a Compatibility Support Module (CSM). It includes Secure Boot certificates, supports GPT disk layouts, and can install to large SSDs (e.g., 16TB). Arca Noae offers an annual subscription package for OS/2 and eCS drivers and software, as well as third-party-developed drivers and software through its online store. Services include developing and maintaining device drivers, repackaging OS/2 software for alternative package managers (YUM/RPM), consulting on OS/2 deployment, maintenance, and upgrade strategies, and helping protect customer investment in OS/2. The company also acts as a gateway for sponsoring OS/2-focused non-profit and volunteer efforts, passing through 100% of contributions made through its online store. Arca Noae maintains close ties to the OS/2 community, sponsoring new development and engaging with users and systems administrators. Its principals and engineers regularly speak at OS/2-focused events and participate in online discussions. The company has a worldwide virtual and physical presence through a network of strategic and consulting partners, supporting enterprises from large to small as well as individual users. Many enterprises rely on OS/2 for critical infrastructure operations and cannot risk losing such a vital piece of their technology; Arca Noae addresses this by providing expertise, hardware upgrade recommendations, and security solutions to bring OS/2 in line with modern data encryption standards and foster new web browser and networking technology. Arca Noae is a private company owned by its managing members. Lewis Rosenthal is the Managing Member of Arca Noae, LLC, and has worked with OS/2 for many years. The company's founding principles include information security, and it applies these principles to its websites and online store. The vast majority of net proceeds from Arca Noae sales are reinvested into further development and support for the OS/2 platform.

  • Arca Noae, LLC founded by former eComStation developers.

  • Company founded (per Wikidata).

  • ArcaOS 5.0 released as the new release of OS/2 for the 21st century.

  • ArcaOS 5.1 released, first OS/2-based OS to boot from UEFI systems.

Products and positioning

Arca Noae positions itself as the leading provider of OS/2-based operating systems and support, bringing OS/2 into the 21st century with security, stability, and modern hardware compatibility.

  • ArcaOS

    Flagship x86 operating system based on OS/2 Warp 4.52, targeted at modern PC hardware.

  • Drivers and software annual subscription

    Annual subscription package for OS/2 and eCS drivers and software.

  • Third-party drivers and software

    Available through Arca Noae's online store.

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