SciCa 3.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The application lies within Productivity Tools, more precisely Calculators. The actual developer of this free Mac application is Euchler Software.
From the developer:
Scica 3.0 is a scientific calculator that can be used to evaluate mathematical expressions and visualize (and analyze) two dimensional y = y(x) functions. This application is free to use and can be distributed without any restrictions.
You may want to check out more Mac applications, such as VAT Calculator, CalcMadeEasy - Multipurpose Calculator or Equation Calculator, which might be similar to SciCa.