ND1 is an advanced, programmable RPL/RPN calculator that can calculate with complex numbers, fractions, vectors, matrices, strings, images, algebraic expressions, and other types of objects. (Even colors!)
In v1.6, you can create your own calculators and interactive tools and share them with the community. Define your own keys, menus and other UI elements. Map them to internal functions and/or your own.
Over 500 built-in operators deliver a total of over 2,000 functions across all object types.
ND1 begins as a modern day update to the RPL calculator line from HP (28, 48-50g) and then adds surprising features and extensibility.
It offers programming in RPL+ and JavaScript, networking, and modern graphics (HTML5) and storage (a database with local and cloud backing). ND1 has an unlimited stack.
Try ND0 before you buy, if youre unsure ND1 is for you.
Theres plenty of documentation for ND1.
Please see the support website for full specs, a "Quick Tour", tutorials, reference documentation, and a discussion forum, where support can be found.