Graphest is a graphing calculator that can faithfully plot arbitrary mathematical relations.
Download the app (available for both macOS and Windows), and try plotting some of the example relations.
Graphest aims to provide a modern, open-source and extensible alternative to GrafEq™ [Ped].
The following algorithms in [Tup01] are implemented: 1.1–3.2, 3.3 (partially), 3.4.1–3.4.3, 3.4.5 (partially).