Sites like spacebar.chat

Bugzilla project's website on the open-source bug-tracking software for planning and releasing software, with documentation, history and donation pages

Open QuarterMaster is an open source inventory management software project with a demo instance and merchandise shop

Prism Launcher: a free open-source Minecraft launcher for managing multiple game instances, accounts and mods, forked from MultiMC

Swing Music, a self-hosted music streaming server and player for your own audio files, with documentation and downloads

Open-source firmware and web app reviving bricked first- and second-generation Nest thermostats, by developer Cody Kociemba

A Lemmy federated news server run by the developer of the Voyager app, for its users and contributors

Zulip, an open-source team chat application with threaded async messaging, API documentation and help center, by Zulip developers

Spicetify, an open-source toolkit for customizing the Spotify desktop app with themes, extensions, custom apps and a command-line tool

DumbWare.io is a small team's open source software studio making stupid simple, uncomplicated self-hosted tools such as DumbKan

ReVanced is a project website for an open-source tool that patches Android apps such as YouTube with ad-blocking and customisation features

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

Viktor's personal blog on search engines, web tools, self-hosting and small-web projects, with posts in English

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

A Linux podcast by hosts Leo and Dan, exploring the history of Linux distributions and topics that matter to them

A self-hosted, open-source bookmark archive tool called LinkAce, built and documented by its developer, for saving and organizing web links

The Fedihosting Foundation's site, a nonprofit's blog and news page on running Fediverse servers such as Mastodon.World and Lemmy.World

PatchMon, an open-source patch management tool for Linux and FreeBSD server fleets, with a blog, documentation and MSP services

Peergos is an open-source encrypted cloud storage service and drive, with its own client and server software

Personal blog and project site by Leo Spratt on self-hosting, tech tools, photography and his music as Spectral Nova

A personal portal of hobby web projects, including a real-time electricity price monitor and a Tetris game

Rocket.Chat, an open source team chat and collaboration platform for secure, self-hosted government and enterprise communications

PinePods is a self-hosted podcast management app built with Rust, with a blog covering its development

A personal website and blog by programmer dimden, with blog posts, small web projects and a donation page

OSNews, a long-running news and discussion site covering operating systems, computing, software development and technology news

Alf.io, an open source event ticketing and attendance management system for organizers, with documentation and community pages

Tasks.org: documentation and product pages for Tasks, a free open-source Android task management app with CalDAV sync

Servers@Home, a home-lab media hub with videos, a blog, a wiki and a community on self-hosting your own data

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

CryptPad, an open-source end-to-end encrypted office suite for real-time collaborative documents, spreadsheets, slides and whiteboards, developed by XWiki SAS

Nginx UI, an open-source web interface for managing Nginx servers with monitoring, configuration backup and cluster management

Open-source software for streaming your own music library from a self-hosted server, with apps and downloads

PufferPanel, an open source web panel for installing and managing game servers such as Minecraft and Source dedicated servers

Pelican is a free, open-source web control panel for hosting and managing game servers in Docker containers

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