JSecureEdit is a project mainly written in Java, it's free.
Java desktop encrypted text editor (crude proof-of-concept)
Warning! This is a crude proof-of-concept effort by a beginner Java developer.
The basic functionality "works", but there's plenty to add/fix.
To test, open up "test.aes.txt" and paste this in as the passphrase: Iñtërnâtiônàlizætiøn
=== annoying dependency
Until I can re-implement this with a native AES-256 library, you must have the "Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files 6" installed in your runtime. http://www.oracle.com/technetwork/java/javase/downloads/index.html
Place the two files "local_policy.jar" and "US_export_policy.jar" in