NCrypted - simple file encryption software with GPU support
NCrypted is a simple file encryption software. It is implemented on top of AES 128-bit algorithm.
This software was designed to be as simple as possible, so you won't find any fancy, flashy gui elements or complicated advanced options.
You can also use it directly from command line.
NCrypted can automatically detect and take advantage of your NVidia graphics card to speed up the file processing.
Simple but Powerful, Cross-Platform Password Management Utility
...For advanced users, it includes a separate utility called Grypto-Transforms, which has a universal hash calculator with all the major hash functions, generic encrypt/decrypt functions and a base64/hex converter.
Although the interface is simple and intuitive, the security is top-notch. It uses AES with CCM to secure and authenticate the data.