Awesome Open Source Applications

Python

ArchiveBox - (Repo, Home, Docs) Self-hosted web archive, for creating local, browsable backups of content from the web. Imports HTML, JS, PDFs, video, subtitles, git repositories, and more, from Pocket, Pinboard, browser history, etc. (organization, linux, windows, docker)
CTFd - (Repo, Home, Docs) CTFd is a Capture The Flag framework focusing on ease of use and customizability. It comes with everything you need to run a CTF and it’s easy to customize with plugins and themes. (server)
FlaskBB - (Repo, Home, Demo, Docs) A classic web forum application (bulletin board) with a modern look. (server)
Grafana OnCall - (Repo, Docs) Developer-friendly incident response with brilliant Slack integration, with a PagerDuty migration path. (server, corp, django)
httpie - (Repo, Home, PyPI) Command-line HTTP client with JSON support, syntax highlighting, wget-like downloads, extensions, and more. (dev, linux, windows, mac)
Isso - (Repo, Home) Lightweight commenting server, designed as a drop-in replacement for Disqus. (server)
NewsBlur - (Repo, Home) Web-based personal news reader. (server, django)
Pi-Hole - (Repo, Home, WP) Linux network-level advertisement and internet tracker blocking application which acts as a DNS sinkhole, and (optionally) a DHCP server, intended for use on a private network. (linux, server)
Reddit - (Repo, Home) Social news forum with voting, commenting, karma, and more. (Archival repo from 2017.) (server)

Wagtail - (Repo, Home) A Django content management system focused on flexibility and user experience. (server, django)