Free fixed income software for linux

Simple Python Fixed-Point Module or SPFPM in short, is a Python module which provides basic facilities for manipulating (binary) fixed-point numbers.
The number of fractional binary digits is tunable, allowing near-arbitrary precision arithmetic. Arithmetic and mathematical functions such as sqrt, exp, log, sin, and cos are available
Enhancements:
- Inverse sin/cosine routines were improved. Inheritance-based typing was replaced by duck-typing.