[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]
Platforms
- Mac
- Windows
- Linux
United States




Apps similar to Challenger include TrueCrypt, which is free. Other options are GnuPG, Kleopatra, Axcrypt and Multron File Guardian. You're spoiled for choice with File Encryption Software like Challenger: we list more than 50 alternatives for Windows, Mac, Linux, Android and iPhone.
[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]




GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications.



Offers robust file encryption with AES-256 for premium and AES-128 for free users, integrated password manager, intuitive interface, support for cloud storage, multilingual options, offline security, group management tools, and secure file deletion features.



Multron File Guardian - A File Encrypter/Decrypter With Many Encryption Algorithm.




BitLocker Drive Encryption is a data protection feature that integrates with the operating system and addresses the threats of data theft or exposure from lost, stolen, or inappropriately decommissioned computers.




Easily encrypt files with user-friendly software using the powerful AES standard for security on Windows, macOS, and Linux, featuring robust 256-bit encryption for safeguarding sensitive data from unauthorized access, ideal for secure data storage, email transmission, and internet uploads.




A simple right-click, you can encrypt files in seconds - without any prior technical knowledge.

Encrypto lets you encrypt files before sending them to friends or coworkers. Just drop a file into Encrypto, set a password, and then send it however you normally would — but this time with added security. It’s free for both Mac and Windows.



FreeOTFE is a free, open source, "on-the-fly" (OTFE) disk encryption program for PCs running MS Windows and Windows Mobile PDAs (FreeOTFE4PDA).




Samsung Secure Folder lets you put to use the power of defence-grade Samsung Knox security platform to protect your files with a private, encrypted space on your phone. Apps and data moved to Secure Folder are sandboxed separately on the device and gain an additional layer of...



Delivers AES 256-bit encryption, instant password-protected file and folder locking, file hiding, shredding, online backup, USB drive security, audit trail, and stealth mode features, supporting documents, videos, images, and wallet details across drives.
