flythink Fk.FCTB by: flythink 1,566 total downloads last updated 12/10/2020 Latest version: 2.16.25.1 Fork of FastColoredTextBox by Pavel Torgashov with small modifications. Fk.xFunc.Maths by: flythink 137 total downloads last updated 10/10/2022 Latest version: 4.1.0 Math Expression Expressions Parser MathParser Differentiation Simplification xFunc.Maths is a simple and easy to use library that allows you to build mathematical expressions.