Hydra vs Persepolis Download Manager

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.

Persepolis Download Manager is free and open-source software for managing downloads. It supports multi-segment transfers, queues, and scheduling, so downloads can be organized and set to run later. Its video finder supports sites including YouTube, Vimeo, and DailyMotion; version 5.2.0 can display thumbnails and choose the highest quality automatically. Persepolis handles HTTP and HTTPS links, with up to 64 connections and SOCKS5 and HTTP proxy support. It runs on Windows, macOS, and Linux, with browser integration guidance for Firefox, Chrome or Chromium, Opera, and Vivaldi. Linux installation choices include Ubuntu, Debian, Arch Linux, Fedora, and openSUSE, as well as a bundle that runs without separately installing prerequisites. The project also provides macOS and Windows installation instructions. Linux and BSD video installations may use yt-dlp and ffmpeg as optional prerequisites. There is no official FreeBSD package, and the version in FreeBSD's official repositories is described as very old.