Best Open Source Apps & Tools

Stratum is an open-source two-factor authentication app for Android that adds an extra security layer to your accounts by requiring a one-time code at login. It supports TOTP and HOTP authenticators w

Proton Authenticator is an open-source, end-to-end encrypted two-factor authentication app that stores your 2FA codes entirely on your device. Built by Proton Mail and protected by Swiss privacy laws,

Bruno is an open-source API client designed for developers who need to test and debug APIs without relying on cloud services. It integrates directly with Git, allowing you to version control your API

Mullvad VPN is a privacy-focused VPN service that encrypts your internet traffic and masks your IP address and location from websites and your ISP. Create an account with no email or personal informat

Thunderbird is a free, privacy-focused email client that lets you manage multiple email accounts from a single app with an optional Unified Inbox. Built on open-source technology and funded entirely b

Proton Mail is an encrypted email app that protects your communications with end-to-end encryption, making messages unreadable to anyone except sender and recipient. Create a @proton.me or @protonmail

motî is a multilingual dictionary app with definitions in over 40 languages, powered by free Wiktionary data. Look up words, explore etymologies to connect new vocabulary with familiar terms, and view

Ente Auth is a 2FA authenticator that generates and stores two-factor verification tokens with end-to-end encrypted cloud backups. Your 2FA codes sync automatically across all your mobile and desktop

Proton Pass is a free, open-source password manager with end-to-end encryption and no ads or data collection. Store unlimited passwords on unlimited devices, autofill logins, generate 2FA codes, creat

Raivo is a two-factor authentication app for iPhone and Mac that stores and generates one-time passwords with end-to-end encrypted iCloud backup and sync. Open the app with Face ID or Touch ID, copy y

Aegis Authenticator is a free, open source app for managing two-factor authentication tokens across your online accounts. It stores all one-time passwords in an encrypted vault that can be unlocked wi

VLC media player is a free, open-source multimedia player that plays movies, shows, and music in most formats without requiring conversion. It supports file synchronization with Dropbox, Google Drive,

NetNewsWire is a free and open source RSS reader that aggregates articles from your favorite blogs and news sites in one place, replacing the need to visit multiple websites or rely on social media al

Lulu is a free, open-source firewall for Mac that blocks unknown outgoing connections to protect your privacy. Designed for users concerned about unauthorized data transmission, it monitors all outbou

MongoDB is a cross-platform document-oriented database that stores data in JSON-like documents with optional schemas. As a NoSQL database, it offers flexibility in data structure compared to tradition

2FAS is a free two-factor authentication app that secures your online accounts with TOTP and HOTP algorithms. It syncs across mobile devices, works offline, and requires no account or password storage

K-9 Mail is an open source email client that works with virtually every email provider. It supports multiple accounts, unified inbox, automatic background synchronization, push notifications, and loca

Telegram Messenger is a cloud-based instant messaging app with over 1 billion active users, offering fast, synced messaging across all devices without requiring your phone to stay connected. Send unli

Signal is a free messaging app built around privacy and encryption. It lets you send texts, voice messages, photos, videos, GIFs, and files over your data connection, avoiding SMS and MMS fees. Make e