Clockwork Orange vs Hydra

Clockwork Orange manages desktop wallpapers on KDE Plasma 6, Windows 10/11 and macOS 13+. It can select random images from local folders, distribute choices fairly among sources and assign a different image to each monitor. On KDE Plasma, it can rotate the lock-screen image separately from the desktop. Download plugins fetch images from Wallhaven and DuckDuckGo Images on hourly, daily or weekly schedules, with a file limit configurable for each source. Wallhaven’s full catalogue requires an API key. The app records image URLs and content hashes to prevent duplicate downloads, even if a file has been deleted. Marking an image in the window deletes the file and adds its hash to a blacklist for future downloads. Version 4 is a native Go program with a command-line binary that also runs as the daemon, plus a Fyne desktop window with plugin controls, history, blacklist management and settings. It is free under the MIT License. On Linux it can run as a systemd user service; the macOS app is ad-hoc signed and not notarised.

Hydra is a continuous integration service for projects based on Nix. It checks out project source periodically or continuously, builds it, runs tests, and produces reports. Work is organized into jobsets whose inputs can trigger builds when they change; jobsets can also depend on one another. Flake jobsets are supported when their outputs expose a hydraJobs attribute set. Jobs can produce packages, ISO images, or tarballs, and jobset inputs can use Git checkout sources. Hydra also provides a JSON API. It is aimed at Nix and NixOS package developers, not people who only need to use NixOS. Hydra is open source under GPL-3.0 and listed at free. It is self-hosted, with no hosted option listed, and running it is currently supported only on NixOS; the repository recommends the NixOS module for production. Flake evaluation is restricted from accessing files outside the Nix store. Some state is stored in the database, so backups are needed, and the wiki reports that hydra-queue-runner can sometimes leave queued builds unscheduled.