Hydra vs Pineapple Pictures

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.

Pineapple Pictures is an image viewer for opening common image formats on Linux, macOS, and Windows. Its listed formats include JPEG, PNG, GIF, SVG, PSD, KRA, XCF, TGA, HDR, and AVIF. A Stay-on-Top setting can keep a reference image visible above other software while you work. The project also lists RAW support and a metadata viewer; optional libexiv2 support is recommended for showing more image metadata.

The viewer is free, and Pineapple Pictures as a whole is licensed under MIT, though individual files may have other compatible licenses. Downloads are linked through GitHub Releases, SourceForge, Arch Linux AUR, itch.io, and FlatHub. Format availability depends on Qt imageformats plugins, which users may need to obtain from their distribution or build themselves on Windows. Release 1.6.0 lists Linux with Qt 6.4 or later and a stacking window manager, Windows x64, and macOS ARM. The maintainer says the project will remain in maintenance mode for the foreseeable future while continuing to receive updates. An itch.io purchase supports development and provides experimental additional format support.