📝 Note-TakingOSS
Org-roam
Plain-text personal knowledge management system that brings Roam-like features to Emacs and Org-mode. Provides networked thought with backlinks, graph visualization, and full offline control. Data stored locally in plain org files with optional GPG encryption. Fully open source under GPL-3.0.
open-sourcenotesknowledge-base
📦 OtherFI
Polar
Polar is a Finnish sports technology company offering GPS sports watches, fitness and wellness watches, heart-rate sensors, and the Polar Flow app/web platform for tracking training, activity, recovery, sleep, and performance metrics. It is aimed at runners, cyclists, multisport athletes, outdoor users, and fitness-focused consumers who want a European alternative to US fitness wearable ecosystems.
fitnesswearablessports-science
🌍 DNS ServicesLU
RESTENA Public DNS Resolver
RESTENA Public DNS Resolver is a public recursive DNS resolver from the Restena Foundation that validates DNSSEC responses and supports DNS-over-TLS and DNS-over-HTTPS.
dnsprivacy
☁️ Cloud StorageDE
Restic
Fast, secure, and efficient open-source backup program with client-side encryption and deduplication. Supports Linux, macOS, Windows, BSD, and stores backups locally, via SFTP, REST servers, or S3-compatible cloud storage. Designed with a strong threat model assuming untrusted storage backends.
open-sourcebackupencryption
✉️ Email ServicesGB
Stalwart Mail Server
All-in-one open-source mail and collaboration server written in Rust. Supports IMAP, JMAP, SMTP, CalDAV, CardDAV and WebDAV protocols. Features built-in DMARC, DKIM, SPF, and ARC support, spam filtering, encryption at rest, and clustering support. Community edition is AGPL-3.0 licensed, with optional enterprise license for additional features.
open-sourceemailmail-server
📲 2FA AuthenticatorsFR
Stratum
Open-source local Android app for 2FA codes with encrypted backups and a Wear OS companion app.
open-source2faauthenticator
📋 Project ManagementDE
Super Productivity
Open-source todo list and time tracking app with Pomodoro timer, task scheduling, and GitHub/Jira integration. Developed by a German individual developer, local-first with no data collection. Supports cross-platform sync via WebDAV and Dropbox.
open-sourceproject-managementtodo
📨 Mail ClientsUS
Thunderbird
Open-source mail client maintained by MZLA/Mozilla for desktop and mobile. Thunderbird is local-first for core mailbox usage and supports open protocols (IMAP/POP3/SMTP), while newer optional Thunderbird Pro services are still early-stage.
open-sourcemail-clientlocal-first
📝 Note-TakingRO
Trilium
Open-source hierarchical note-taking application for building personal knowledge bases. Features include rich WYSIWYG editing, code notes with syntax highlighting, note encryption, powerful search, note versioning, and synchronization with self-hosted server. Cross-platform (Windows, Mac, Linux) with mobile web interface. Developed by community with main maintainer Elian Doran based in Romania.
open-sourcenotesknowledge-base
🛍️ App StoresIN
Aurora Store
Open-source Google Play Store client for Android. Allows downloading, updating, and searching apps from Google Play without requiring Google Play Services. Features include anonymous login, device/locale spoofing, Exodus Privacy integration for tracker detection, and update blacklisting. Developed by independent developer Rahul Kumar Patel.
open-sourceapp-storeandroid
📨 Mail ClientsES
Betterbird
Betterbird is a free, open-source desktop mail client and soft fork of Mozilla Thunderbird that adds extra bug fixes, Outlook-like multi-line views, stronger search and tray features, and other power-user improvements while staying compatible with Thunderbird profiles. It targets users who want a more stable and feature-rich email client on Windows, Linux, and macOS.
desktop-appemail-clientopen-source
🤖 Large Language ModelsPL
Bielik AI
Polish open-model LLM initiative by Fundacja SpeakLeash. Bielik models are published for local use via Hugging Face, with Apache-2.0 licensing for the Bielik 3.0 model line.
open-sourceai-mlllm
🎥 Meeting SoftwareCA
BigBlueButton
Open-source web conferencing system designed for virtual classrooms with features like screen sharing, breakout rooms, polling, whiteboards, and recording. Originally developed at Carleton University in Ottawa, Canada, BigBlueButton is fully self-hostable under LGPL-3.0 license and can be deployed on European infrastructure for GDPR compliance.
open-sourcemeeting-softwarevideoconferencing
🗺️ Maps & NavigationFR
Cartes.app
Cartes.app is a free, open-source web mapping service from France based on OpenStreetMap and other commons/open-data sources. It provides modern browser-based maps with place search, points of interest, photos, routing for walking, cycling, public transport and trains, 3D/globe views, GPX export, and embed support, aimed at users who want a sovereign web alternative to Google Maps and Apple Maps.
open-sourceopenstreetmapprivacy-focused
💬 MessagingDE
Delta Chat
German decentralized messenger by merlinux GmbH (Freiburg) that runs over existing e-mail providers instead of centralized app servers. Supports end-to-end encryption via Autocrypt and verified groups, with clients for Android, iOS, and desktop.
open-sourcemessagingdecentralized
🛍️ App StoresIN
Droid-ify
Droid-ify is a free, open-source Android client for browsing, installing and updating apps from F-Droid-compatible repositories. It provides a clean Material-style interface, background updates, multiple install methods including session, root and Shizuku, custom repository support and offline browsing after the initial sync for Android users who want a FOSS app-store experience outside Google Play.
androidapp-storef-droid
🤖 Large Language ModelsEU
EuroLLM
EuroLLM is a pan-European open-source family of multilingual large language models (including 1.7B, 9B, and 22B variants) built to support all 24 official EU languages plus additional languages. It offers base and instruction-tuned checkpoints on Hugging Face, can be run on your own infrastructure, and targets developers, researchers, and organizations building chat, translation, and other multilingual AI applications.
open-sourcemultilingualllm
🌐 BrowserJP
Floorp Browser
Floorp Browser is a free, open-source desktop web browser from Japan based on Mozilla Firefox. It focuses on privacy, user control, and deep interface customization, including features such as workspaces, mouse gestures, split view, web apps, and flexible tab and layout options for users who want a more configurable browser than mainstream Chrome-style defaults.
open-sourcefirefox-basedprivacy-focused
📰 Feed ReadersOSS
FreshRSS
FreshRSS is a free, self-hostable, open-source RSS and Atom feed reader for people who want to follow blogs, news sites, podcasts, newsletters, and video channels without relying on a hosted US service. It offers multi-user support, OPML import/export, filters and saved searches, WebSub, web scraping for sites without feeds, extensions and themes, and APIs for third-party clients.
open-sourceself-hostablerss
👥 Social MediaOSS
Friendica
Versatile federated social platform that bridges multiple networks. Friendica connects to Mastodon, Diaspora, Bluesky, and more from a single account, offering Facebook-style features like events, photo albums, and threaded discussions.
open-sourcesocial-mediafederated
💬 MessagingFR
Gajim
Free and fully featured desktop XMPP client for decentralized messaging. Gajim supports end-to-end encryption with OMEMO and OpenPGP, voice messages, file transfers, and group chats. Available for Windows, macOS, and Linux.
open-sourcemessagingfederated
📋 Project ManagementUS
Huly
Huly is an open-source all-in-one platform for project, process, time, and knowledge management. It combines project boards, team planning, chat, documents, virtual office/video collaboration, inbox workflows, and bidirectional GitHub synchronization for developers, product teams, and collaborative organizations.
open-sourceself-hostableproject-management
📦 OtherDE
Input Remapper
Input Remapper is a free, GPL-licensed Linux desktop tool and background service for remapping keyboard keys, mouse buttons, wheels, joysticks, and gamepad inputs, with GUI profile management and programmable macros. It supports X11 and Wayland, ships through distro packages and GitHub releases, and is aimed at Linux users who want vendor-free device customization, accessibility tweaks, or gaming-style button automation.
open-sourcelinuxinput-remapping
🎥 Meeting SoftwareFR
Jitsi
Open-source video conferencing platform for browser-based meetings with chat, screen sharing, and collaborative notes. Jitsi offers a free public instance at meet.jit.si, no account required, and supports self-hosting for teams that want EU-friendly data and infrastructure control.
open-sourcemeeting-softwarevideoconferencing