The main features of sixways/facepaint are: Mesh and Geometry.
Open-source alternatives to sixways/facepaint include: geniikw/drawline — draw line in unity3d. johannesugb/volumetriclinesunity. kaiware007/icosphrecreator. keenanwoodall/deform. microgsd/roadarchitect — Road Architect for Unity. nesh108/unity-2.5d-destruction.