BlackCat! is a proprietary encryption algorithm that can be used to securely encrypt and compress data. BlackCat! Encoder 2.0 is the most recent and best version that is not backwards compatible. For security's purposes I won't go into detail about how it works. Just enter the data you wish to convert and a password. Your data is never stored on this web server and if you forget your password, there is nothing I can do to decode it.
There are also no plans to port this web application (or any in the archive) to a client application. The main source of this algorithm's security is that the software is hidden and requires a time delay of 1 second for any data processing to prevent brute force attacks. If you need the ability to decode your data without an internet connection this will unfortunately not work for you.