Mobile Application Apps and Services

FreeOTP is a free and open-source two-factor authentication application for generating one-time passwords, supporting both HOTP and TOTP standards. It enhances online security by providing an extra layer of protection beyond just passwords.

Electrum is a free and open-source Bitcoin wallet renowned for its speed, low resource usage, and strong security features. It runs on various operating systems and supports hardware wallets for enhanced protection.

Mozilla Firefox is a powerful, open-source web browser developed by the not-for-profit Mozilla Foundation. Known for its strong focus on user privacy and customization, Firefox offers a fast and secure browsing experience across multiple platforms, supported by a vast ecosystem of extensions.

Cryptonite is an Android application that provides robust data security by integrating with popular encryption schemes like EncFS and TrueCrypt. It allows users to securely browse, export, and open encrypted files and directories, both locally on their device and within their Dropbox account.

RedReader is a highly-regarded open-source Reddit client for Android, prioritizing a fast, efficient, and ad-free browsing experience. It offers extensive customization options, offline capabilities, and a focus on user privacy.

Silence.im is an encrypted text messaging application for Android that prioritizes user privacy and security. It allows for secure communication via SMS/MMS, offering end-to-end encryption when communicating with other Silence users. The app is open-source and ad-free, providing a simple yet powerful platform for private mobile messaging.

Disa is a unified messaging hub that consolidates conversations from various services like SMS, Facebook, and WhatsApp into a single interface, simplifying communication management.

Transdroid is a comprehensive Android application designed for remotely managing your torrent downloads. It connects to a wide range of popular torrent clients on your desktop or server, allowing you to monitor and control ongoing downloads, add new torrents, and manage your torrent queue directly from your mobile device. It also offers built-in features like torrent searching.

Zulip is a powerful open-source group chat application designed for team collaboration. It uniquely structures conversations around topics, enabling users to easily catch up on important discussions and manage information overload. Zulip facilitates secure communication with integrated file sharing and various integrations.

Etar is a free and open-source material design calendar application for Android, prioritizing privacy and a clean user experience. It focuses on core calendar functionalities like event management and reminders, offering data export/import and syncing capabilities without ads or excessive features.

Magpie was a note-taking application designed as an alternative to Evernote, leveraging Git for version control and synchronization. It focused on providing a robust, offline-first experience with privacy in mind.

Tint Browser is a discontinued open-source web browser for Android 4+ focusing on customization, privacy, and a lightweight design. It offered a tabbed interface, bookmark management, and built-in ad blocking, catering to users seeking an alternative to mainstream browsers with more control.

AnkiDroid is a powerful and free open-source mobile application for learning and memorizing through spaced repetition flashcards. It leverages the proven principles of spaced repetition to help users effectively retain information for the long term across various subjects and disciplines.

Omni Notes is a versatile open-source note-taking application for Android. It emphasizes simplicity, lightweight design, and offline functionality while providing robust features for organizing and managing your notes effectively.

Twidere is a powerful and open-source Twitter client for Android, emphasizing customization, privacy, and support for multiple social networks beyond just Twitter, offering a refreshing Material Design interface.

Kid3 is a powerful and versatile cross-platform audio tag editor that supports multiple audio file formats. It is designed for both novice and experienced users to efficiently organize and manage their music collections through comprehensive metadata editing features.

Xabber is a free and open-source XMPP (Jabber) client for Android. It provides secure and reliable instant messaging with support for various XMPP features, including encryption, group chat, and decentralized communication. Leveraging the open XMPP protocol, Xabber offers a privacy-friendly alternative to centralized messaging platforms.

Cryptomator offers transparent client-side encryption for cloud storage. It creates virtual encrypted drives, allowing you to protect your sensitive files on platforms like Dropbox, Google Drive, and OneDrive without sacrificing convenience or syncing capabilities. Your data remains confidential, even if the cloud provider is compromised.

Money Manager Ex (MMEX) is a free, open-source, cross-platform personal finance software designed for easy money management. It offers tools for budgeting, expense tracking, and financial reporting across various accounts, suitable for beginners and those seeking a straightforward approach.

Turtl is a secure and private note-taking, bookmarking, and document storage application. It utilizes strong client-side encryption to ensure that only you and authorized collaborators can access your sensitive information, making it ideal for managing confidential projects and data.

Minds is an open-source and decentralized social networking service dedicated to online freedom, privacy, and monetization for content creators. It champions free speech and offers a platform that rewards users for engagement through a points and token system.

Butter Project is a discontinued open-source application suite designed for streaming video content over the BitTorrent protocol. It allowed users to watch movies and videos directly from torrents without needing to download the entire file, leveraging peer-to-peer technology for media consumption.

AntennaPod is a free and open-source podcast player for Android, designed for listeners who value control, privacy, and a clean experience. It offers a robust set of features for discovering, downloading, and managing your podcast library.

Libre.fm is a free and open-source music streaming platform that champions independent artists and fosters a strong community of music lovers. Discover new music, share your favorites, and enjoy an ad-free listening experience.

Sky Map is a user-friendly Android planetarium app that turns your device into a window to the universe. Simply point your phone at the sky to identify stars, constellations, planets, and more. It's an excellent tool for both casual stargazers and budding astronomers.

FBReader is a versatile and free ebook reader application supporting multiple formats including ePub, Kindle azw3, and fb2. It offers a customizable reading experience across different platforms with features like library management, synchronization, and text-to-speech.

Tutanota is a leading open-source email service offering robust end-to-end encryption and enhanced privacy. It provides a secure platform for communication and calendar management, accessible via web and dedicated applications.

KeePassDroid is a robust and open-source password management application for Android devices, offering strong encryption and compatibility with the popular KeePass password safe format. It provides secure local storage for your credentials, ensuring your sensitive data remains protected on your device.

ONLYOFFICE is a powerful and secure office suite offering online document, spreadsheet, and presentation editors. It fosters collaboration with real-time co-editing and integrates seamlessly with various cloud storage services, providing a robust platform for both individual and team productivity.

ProtonMail is a leading secure email service utilizing end-to-end encryption and zero-access architecture to protect user privacy. Developed by scientists at CERN, it offers a robust and user-friendly platform for sending and receiving confidential communications.

FreeOTP is a free and open-source two-factor authentication application for generating one-time passwords, supporting both HOTP and TOTP standards. It enhances online security by providing an extra layer of protection beyond just passwords.

Electrum is a free and open-source Bitcoin wallet renowned for its speed, low resource usage, and strong security features. It runs on various operating systems and supports hardware wallets for enhanced protection.

Mozilla Firefox is a powerful, open-source web browser developed by the not-for-profit Mozilla Foundation. Known for its strong focus on user privacy and customization, Firefox offers a fast and secure browsing experience across multiple platforms, supported by a vast ecosystem of extensions.

Cryptonite is an Android application that provides robust data security by integrating with popular encryption schemes like EncFS and TrueCrypt. It allows users to securely browse, export, and open encrypted files and directories, both locally on their device and within their Dropbox account.

RedReader is a highly-regarded open-source Reddit client for Android, prioritizing a fast, efficient, and ad-free browsing experience. It offers extensive customization options, offline capabilities, and a focus on user privacy.

Silence.im is an encrypted text messaging application for Android that prioritizes user privacy and security. It allows for secure communication via SMS/MMS, offering end-to-end encryption when communicating with other Silence users. The app is open-source and ad-free, providing a simple yet powerful platform for private mobile messaging.

Disa is a unified messaging hub that consolidates conversations from various services like SMS, Facebook, and WhatsApp into a single interface, simplifying communication management.

Transdroid is a comprehensive Android application designed for remotely managing your torrent downloads. It connects to a wide range of popular torrent clients on your desktop or server, allowing you to monitor and control ongoing downloads, add new torrents, and manage your torrent queue directly from your mobile device. It also offers built-in features like torrent searching.

Zulip is a powerful open-source group chat application designed for team collaboration. It uniquely structures conversations around topics, enabling users to easily catch up on important discussions and manage information overload. Zulip facilitates secure communication with integrated file sharing and various integrations.

Etar is a free and open-source material design calendar application for Android, prioritizing privacy and a clean user experience. It focuses on core calendar functionalities like event management and reminders, offering data export/import and syncing capabilities without ads or excessive features.