Free Software Foundation

This is a free library that enables developers to perform arbitrary precision arithmetic. It is designed to perform calculations with extremely high precision rates, offering a range of functions to help with complex calculations.

GNU Oleo is a spreadsheet software that is light in weight, with internationalization support, and different interfaces. It comes with an easy-to-use compilation process and has the ability to print and plot data.

GNU Mail Utils package provides primary mail utilities, including a POP3 server, IMAP4 server, Sieve mail filter, POSIX mailx client, and other tools. Ideal for managing email communication effectively.