The files in this directory

MathUtil.hh
    A few math utilities

Props.hh
    A class for managing properties (name-value pairs) read from a file

Sched.hh
    A simple event scheduler

tinyexpr.h
    A parser and evaluator for simple math expressions

Trace.hh
    A utility for tracing program flow and state

Util.hh
    Miscellaneous utility functions for math, random numbers, string
    manipulation, type conversion, command line parsing etc.

fmt
    An open-source library for formatted printing (printf/iostreams replacement)