JCrypTool (JCT) is an open-source e-learning platform, allowing to experiment comprehensively with cryptography on Linux, MAC OS X, and Windows.
Land der Ideen - Statements
"I have been using CrypTool to support laboratory teaching of our cryptography class at Royal Holloway, University of London for several years now and it just keeps getting better and better." (September 2012)
Professor Keith M. Martin, Director of the Information Security Group (ISG) at Royal Holloway, University of London.