spigot
A normal calculating program, given a mathematical expression to evaluate, will want to know in advance how many digits of output are needed (if it even has that option), and if the expression includes more than one successive operation, then rounding errors will build up so that the last few digits are potentially wrong, or perhaps more in some cases (e.g. if significance loss occurs).
spigot, by contrast, does not output any digit of the answer until it's sure that the digit is right.
Packages are available for the following releases:
Ubuntu 16.04: 20170903.df57f3c-1~getdeb1
Ubuntu 16.10: 20170405.66b4e74-1~getdeb1
Ubuntu 17.04: 20170903.df57f3c-1~getdeb1

Package downloads per version:
Version 20170405.66b4e74: 115
Version 20170903.df57f3c: 120

Install the application manually with the following commands:
sudo apt-get update && sudo apt-get install spigot

Uninstall the application with the following command:
sudo apt-get remove spigot

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