Challenger Alternatives
Challenger is described as 'software for the encoding of files, folders and drives. For the installation and for the execution simple user rights suffice. Thereby the program is mobil usable on an USB flash drive too' and is an app in the security & privacy category. There are more than 50 alternatives to Challenger for a variety of platforms, including Windows, Linux, Mac, Android and iPhone. The best alternative is TrueCrypt, which is both free and Open Source. Other great apps like Challenger are GnuPG, Windows BitLocker, Kleopatra and AES Crypt.
Challenger alternatives are mainly Disk Encryption Tools but may also be Project Management Tools or Task Management Tools. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Challenger.
[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]
Discontinued
Currently unmaintained. Last version, TrueCrypt 7.1a, is still available for download and development has continued via the forks
VeraCrypt and 
CipherShed. "The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP. Windows 8/7/Vista and later offer integrated support for encrypted disks and virtual disk images."
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.
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.
- Free • Open Source
- Windows
- Linux
- GnuPG
It supports managing X.509 and OpenPGP certificates in the GpgSM keybox and retrieving certificates from LDAP servers.
- Free • Open Source
- Mac
- Windows
- Linux
- Android
- iPhone
- Android Tablet
- iPad
AES Crypt is an advanced file encryption utility that integrates with the Windows shell or runs from the Linux command prompt to provide a simple, yet powerful, tool for encrypting files using the Advanced Encryption Standard (AES).
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.
- Freemium • Proprietary
- Mac
- Windows
- Android
- iPhone
- iPad
AxCrypt is a simple file encryption software for Windows. It integrates seamlessly with your workflow to encrypt, decrypt, store, send and work with files.
EncFS provides an encrypted filesystem in user-space. It runs without any special permissions and uses the FUSE library and Linux kernel module to provide the filesystem interface. You can find links to source and binary releases below.
Warning
The author has agreed that EncFS in its current form is dangerous (to security) for several reasons. Wikipedia has a brief summary: https://en.wikipedia.org/wiki/EncFS#General_Security_ConcernsThe actual audit, which the author participated in, is here: https://defuse.ca/audits/encfs.htm
No screenshots yet
- Freemium • Proprietary
- Online
- Android
- iPhone
- Software as a Service (SaaS)
Podio is an online work platform. Combining hundreds of specialized and flexible work apps with messaging, tasks, reporting, workflow and contact management, Podio lets you build and shape the online workplace most fitting to your role.
- Free • Open Source
- Mac
- Windows
- Linux
- BSD
Platform-independent password-based authenticated encryption of files & folders.
