===============================================================================
Javascript

Filesaver
https://github.com/eligrey/FileSaver.js

Gibberish AES
https://github.com/mdp/gibberish-aes

Other crypto, not used
https://code.google.com/p/crypto-js/#Quick-start_Guide
http://crypto.stanford.edu/sjcl/
http://people.eku.edu/styere/Encrypt/JS-AES.html
http://www.movable-type.co.uk/scripts/aes.html

===============================================================================
Client encryption

Openssl
http://stackoverflow.com/questions/10106771/encrypt-a-string-using-openssl-command-line

Other crypto, not used
https://pypi.python.org/pypi/pycrypto