Buffer 

Constructs a polygon at a specified distance from the geometry

Unary union 

This node find unary union of geometries

WFS connector 

This node connects to a WFS service and user can select a source from there.

Difference 

This node computes difference of geometries

Line to polygon 

Converts linestring or multilinestring to polygon

Snap to grid 

This node snaps all points of the input geometry to a regular grid

Vertices to points 

Converts the vertices of geometry to points