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ChemCalc is intended to be a calculator oriented towards chemistry. What is being implemented at this point is a set of prompts to take information from the user to calculate certain values dependent on the particular scientific law you specify.
Once the development process leads to a stable and semi-productive program, a plugin system will be developed and implemented. The benefits of a plugin system would be the ability to add features without having to edit the program source code. Perhaps, with the help of developers and end-users, ChemCalc will develop into something more than a calculator geared towards chemistry.