Na serveru Slunečnice.cz je zajímavá iOS aplikace:

Калькулятор Fn 3.2

Engineering calculator with 8 programmable buttons allows you to select from the total list of exactly those features that You need. The buffer memory for arithmetic operations facilitates the work with subsets of data. The possibility of calculating interest and editing in data entry. Intuitive…

Adresa: https://www.slunecnice.cz/sw/kalkulator-fn/