These are the functions that are available when parsing most fields withing Streamer.bot, so anywhere you can do a %variable% replacement, you'll be able to do a $function()$ as well.
All functions will also parse variable replacements within the function call itself, so if you have $math(%x% + %y%)$, the %x% and %y% will be replaced with there appropriate values before evaluating the math equation.
These are just a few functions that I do plan on adding, there is no timeline as to when they will be added, but they will be.