hdosys is a software publisher focused on developer tooling for the Windows ecosystem, maintaining its projects publicly through its GitHub presence, where users can review source code, track releases, and follow ongoing development. The publisher's catalog centers on the Herdr product family, a small but focused range aimed at developers, DevOps practitioners, and teams that rely on automated coding agents and repeatable development environments. The flagship product, Herdr Sandbox, addresses the growing need for isolated, disposable environments in which development workloads and AI-assisted coding agents can run without risking the host system; by leveraging Windows Sandbox, it allows users to spin up clean, ephemeral Windows instances for testing, experimentation, build verification, and running untrusted or experimental code, with each instance discarded after use to eliminate configuration drift and leftover state. This makes it particularly relevant for workflows involving autonomous coding agents, continuous integration tasks, and security-conscious development practices. Complementing this is Herdr Win, the native Windows distribution of Herdr, which packages the tooling for direct installation and use on Windows machines, giving users a straightforward way to adopt the platform within their existing setup. Together, the two products reflect a common category of modern developer infrastructure software: environment orchestration, sandboxing, and workload isolation. Typical use cases include safely evaluating code generated by automated agents, reproducing bugs in pristine environments, running integration tests without polluting a developer workstation, and standardizing development setups across a team. Although the current catalog is compact, with two packages published to date, it targets a well-defined niche at the intersection of Windows development, automation, and sandboxed execution, and the open GitHub distribution model supports transparency, community feedback, and easy access for developers evaluating the tooling.