This is a gallery of curves, by Wikipedia page. See also list of curves.
Ampersand curve
Astroid
Atriphtaloid
Bean curve
Bicorn
Bicuspid curve
Bow curve
Bullet-nose curve
Cardioid
Circle
Cissoid of Diocles
Conchoid of de Sluze
Crooked egg curve
Cruciform curves
Cubic plane curve
Spiric sections
transformed bicorn
Trott curve
Visual Dictionary of Special Plane Curves