Scientific Calculator

Tabbed UI with Favorite buttons in one tab for easy access.
This is the first version and I have plans to add significant features and more functions in the future.
The core of this calculator is fully extensible and I have plans to allow users to add custom functions to the calculator in the future. They could use these custom function exactly the same way they use the in-built functions.
Right-now, I'm low on development resources. Will resume development soon.