ArcaOS

ArcaOS is a proprietary operating system derived from IBM's OS/2 Warp 4, developed and sold by Arca Noae. It is designed to run on modern x86 personal computers and to provide a contemporary, supported environment for OS/2 applications, preserving the OS/2 API and Presentation Manager interface while incorporating updated drivers and utilities.

History and goals: After IBM stopped official OS/2 development, Arca Noae launched ArcaOS to continue the OS/2 ecosystem for users with legacy software and mid‑range workstation tasks. The distribution emphasizes compatibility with existing OS/2 applications and offers ongoing updates to support newer hardware.

Design and features: ArcaOS ships with updated device drivers, networking components, and a modern installer. It retains familiar OS/2 subsystems and tools, and provides POSIX compatibility tools for developers. The platform is positioned as a continuation of the OS/2 experience rather than a general‑purpose modern operating system.

Hardware and software compatibility: ArcaOS targets a broad range of x86 hardware and supports running native OS/2 applications. While it can run many legacy programs, compatibility depends on the application and hardware configuration.

Licensing and availability: ArcaOS is sold commercially by Arca Noae and is available with trial licenses. Updates and new versions are distributed through official channels.

Reception and status: ArcaOS is a niche operating system within the OS/2 community, valued for preserving OS/2 software on modern hardware. Development has continued with periodic releases to improve hardware support and stability.