Using encryption to secure your code or text. Click File->Run to run your code using Ruby, see the pop up for output. Never save your text or code to disk unencrypted. Don't forget your password. Encryption is error-persistent.
A Ruby file parser/interpreter/preprocessor that comments lines of code based on conditions at the time the file is required. Very handy to implement debugging logs and code that has to be commented (not just dynamically switched off).
Lich is a cross-platform multithreaded interpreter meant exclusively for use with text-based MUDs. The application natively supports the Ruby language as well as the Simutronics "Wizard" script standard including their StormFront expansions.