Sites like quad4.io

unsigned.io is a personal site by an independent developer covering Reticulum mesh networking, LXMF messaging, and open-source RNode radio hardware

Personal portfolio of Imran R featuring a homelab infrastructure-as-code setup, Kubernetes and Docker Compose projects, and the Obtainium Android app

MeshCore, an open source off-grid encrypted messaging system with MIT-licensed firmware, apps and solar-powered long-range radio repeaters

Papra, an open-source self-hostable document management platform for archiving, tagging and searching scanned paper files

Kavita, a self-hosted digital library server for EPUB, PDF, comic and manga reading with built-in readers

Komga, an open-source media server for digital comic and manga libraries, with documentation and blog posts by developer gotson

Cinny, an open source Matrix chat client with an end-to-end encrypted messaging interface on the web and desktop

AI-powered, self-hostable photo and video management app PhotoPrism for browsing, tagging, searching and sharing media

Linkwarden, an open source bookmark manager for saving, annotating and preserving web pages, with apps and a browser extension

Open source self-hosted live streaming server software called Owncast, with built-in chat, notifications and fediverse support

Neovim, a Vim-based open-source text editor project with extensible Lua plugins, documentation and developer resources

Vikunja, an open-source self-hostable task manager with lists, Kanban and Gantt views, with documentation and a Pro tier

F-Droid is an app store and distribution platform for free and open source Android apps

FreshRSS, a free self-hosted RSS and Atom feed aggregator with a blog and project contact pages

Matrix.org, the home of an open, decentralised network for secure chat and communication, run by the Matrix project

Nextcloud, an open source self-hosted platform for file sharing and online collaboration as a Microsoft 365 alternative

Conduit: a simple, fast chat server software project for hosting your own Matrix messaging server

Super Productivity, an open-source task manager and time tracker app for planning deep work and tracking time spent

Syncthing, an open-source continuous file synchronisation tool, with project donation and foundation information pages

Calibre, a free open-source e-book management software for converting, organising and syncing e-books across devices

Open WebUI, a self-hosted software platform for running and connecting AI models, with a user community and documentation

Node-RED, an open-source low-code tool for wiring event-driven applications and real-time data flows, with a blog and documentation

Pi-hole, a network-wide ad-blocking DNS server software project with installation guides and donation pages

Libretro, a project and website for the crossplatform application API behind the RetroArch emulator frontend, with news and forums

Amnezia, a VPN service and open-source app for internet privacy and circumvention, with a news blog and guides

Pleroma, a lightweight social networking server software project for the Fediverse, with a news page and blog

An open source PlayStation 2 emulator project, with a website carrying its blog posts and project information

Joplin, an open source note-taking app with multimedia notes, web clipping and end-to-end encrypted sync, developed by Laurent

Org Mode for GNU Emacs: a plain-text major mode and project site for notes, to-do lists, planning and literate programming

Nitter, a free alternative front-end for browsing X (formerly Twitter) without an account, run by its maintainer Wooji

The official home of Xfce, a lightweight desktop environment for UNIX-like operating systems, with release news and blog posts