👥 Social MediaMX
Pubky
Decentralized P2P social media protocol and application where users own their data through public-key cryptography. Built on PKARR (Public Key Addressable Resource Records) using BitTorrent's Mainline DHT for censorship-resistant storage, with self-sovereign homeservers and no central authority.
open-sourcesocial-mediap2p
📝 Note-TakingOSS
Quillpad
Quillpad is a free and open-source Android note-taking app for Markdown notes and task lists, with notebooks, tags, reminders, attachments, backups, and optional file-system/Nextcloud sync for users who want a privacy-focused notes workflow.
open-sourcemarkdownandroid
📰 Feed ReadersCN
Read You
An Android RSS reader presented in Material You style. Read You is a free and open-source feed reader that supports multiple account types including Fever, Google Reader API, FreshRSS, Miniflux, Tiny Tiny RSS, Inoreader, Feedly, and Feedbin. Features include article sync, notifications, OPML import/export, and full content parsing.
open-sourcerssfeed-reader
📝 Note-TakingGB
Saber
Saber is a cross-platform note-taking app focused on handwritten notes. It offers pen and highlighter tools, nested folders, dark-mode note inversion, and optional encrypted sync through Nextcloud-compatible servers that users can choose or self-host, making it suitable for students, professionals, and anyone who wants privacy-friendly digital handwriting across devices.
open-sourcehandwritingcross-platform
🛡️ Privacy ToolsAT
Safing Portmaster
Open-source application firewall and network monitor that gives granular control over device traffic, with built-in tracker/ad blocking and secure DNS (DoH/DoT). Developed by Austrian company Safing ICS Technologies under GPLv3, with the optional SPN (Safing Privacy Network) offering multi-hop privacy routing. Audited by Cure53.
open-sourcefirewallnetwork-monitor
☁️ Cloud StorageCN
Seafile
Seafile is a cloud storage, file synchronization, sharing, and document collaboration platform with metadata-based file organization.
file-syncfile-sharingcloud-storage
💬 MessagingGB
Stoat
Open-source chat platform (formerly Revolt) founded in 2021, developed by a team of friends who wanted to create a user-first chat app. Fully open-source under AGPL-3.0 with clients for web, desktop, Android, and iOS. Backend written in Rust, frontend in TypeScript/Solid.js. 600k+ users, 150k+ lines of code. Headquartered in London, UK.
open-sourcemessagingdiscord-alternative
📋 Project ManagementDE
TimeScribe
Modern and private time tracking application for macOS and Windows. Completely free with no paywall or freemium model, no registration required, and 100% offline operation - all data stays locally on the user's device. Developed by a German individual developer in Munich.
open-sourcetime-trackingproject-management
🌐 BrowserOSS
Zen Browser
Zen Browser is a free, open-source Firefox-based browser focused on privacy, productivity, and interface customization. It offers workspace-style tab management, split view, compact mode, and cross-platform support for Windows, macOS, and Linux, targeting users who want a calmer, less telemetry-heavy alternative to mainstream US browsers.
browseropen-sourceprivacy-focused
💬 MessagingUS
Zulip
Open-source team chat with unique topic-based threading that combines the best of email and chat. 100% Apache 2.0 licensed open source with server, web, and mobile apps. Features include real-time messaging, file uploads, integrations, and video calls. Used by thousands of organizations including universities and open-source projects. Self-hostable or cloud-hosted.
open-sourcemessagingteam-communication
🏠 Smart HomeDE
ioBroker
Open-source smart home automation platform that connects various devices, systems, and protocols through adapters. Supports automation via JavaScript scripts or visual tools, with local-first control and self-hosting capabilities.
open-sourcesmart-homehome-automation
📱 Mobile Operating SystemsFR
iodéOS
iodéOS is a privacy-focused, de-Googled mobile operating system based on Android/LineageOS. It combines a system-wide tracker and ad blocker, OTA security updates, privacy-friendly preinstalled apps, and optional self-installation on supported devices or preinstalled iodé smartphones. It is aimed at users and organizations that want a production-ready smartphone OS with less Google dependence and stronger privacy defaults.
open-sourceprivacy-focuseddegoogled
📨 Mail ClientsDE
Bulwark Webmail
Bulwark Webmail is a modern, self-hosted webmail client for Stalwart Mail Server built with Next.js and JMAP.
self-hostedjmapwebmail
📅 SchedulingSA
Etar
Open-source material designed Android calendar app, ad-free and free of charge. Fork of AOSP Calendar with enhanced features including month/week/day/agenda views, offline calendar support, dark/light themes, and multilingual UI. Available on F-Droid and Google Play.
open-sourcecalendarproductivity
📄 Office SuiteOSS
Euro-Office
Euro-Office is a self-hostable office suite with real-time collaborative editors for documents, spreadsheets, presentations, and PDFs.
self-hostedcollaborative-editing
📊 AnalyticsUS
GlitchTip
GlitchTip is an open source application monitoring platform for error tracking, performance monitoring, uptime checks, and logs with Sentry SDK compatibility.
open-sourceself-hostederror-tracking
🔑 Identity & Access ManagementOSS
Kanidm
Kanidm is an open-source identity management platform for authentication, authorization, SSO, LDAP, RADIUS, and related account services.
ssoldapradius
🔑 Identity & Access ManagementOSS
Keytrace
Keytrace is an ATProto identity-verification service that links a Bluesky or ATProto identity to external accounts with cryptographically signed portable claims.
identity-verificationatprotobluesky
🌍 DNS ServicesSE
Mullvad DNS
Mullvad DNS is a privacy-focused encrypted DNS resolver from Sweden-based Mullvad VPN AB. It provides DNS over HTTPS and DNS over TLS, can be used without a Mullvad account, and offers optional blocking profiles for ads, trackers, malware, adult content, gambling, and social media, with QNAME minimization and anycast routing for resilient public DNS use.
dnsprivacy-focuseddns-over-https
🔒 VPNUS
Nebula
Nebula is a self-hosted, peer-to-peer overlay networking tool for connecting hosts through encrypted tunnels.
vpnpeer-to-peeroverlay-network
📝 Note-TakingPL
Neorg
Modern organization tool for Neovim, designed as a reimagined alternative to Emacs Org-mode. Features include structured note-taking, task management, time tracking, and documentation writing, all built on a single extensible file format (.norg). Fully open-source with active development and international contributors.
open-sourcenotesknowledge-base
📲 2FA AuthenticatorsDE
Nitrokey
Nitrokey is a German line of open-source hardware security keys for two-factor authentication, passkeys, FIDO2/WebAuthn, OpenPGP, S/MIME, SSH login, key management, and encrypted storage. It targets individuals, administrators, and organizations that want local hardware-backed authentication and cryptographic key storage without relying on a US authenticator app or proprietary security-key ecosystem.
hardware-security-key2fafido2
🤖 Large Language ModelsAT
ParseHawk
ParseHawk is a self-hosted document AI developer preview that turns PDFs, scans, images, text and Markdown into schema-validated JSON through a REST API, CLI and Web UI; its bundled local model runtime supports macOS Apple Silicon and Linux with NVIDIA GPUs, not Windows or Intel Macs.
document-aidocument-extractionlocal-first
👥 Social MediaCA
Primal
Nostr client developed by Primal Systems Inc. (Toronto, Canada) with mobile apps for Android/iOS and a web application. Features include easy onboarding, smooth feeds, built-in bitcoin Lightning wallet, content discovery, and remote signing. Full open-source under MIT license.
open-sourcesocial-medianostr