GeoNodesExample_018 FramesAndHoles.blend
Blender 3.2+
Frames, holes, cuts, fillets, grids and grills

GeoNodesExample_019_GeometricUVunwrap.blend
Blender 3.4+
Interactive way of unfolding a mesh into a plane using its own UVs.

GeoNodesExample_020 ParametricPolylineFillet.blend
Blender 3.0+
Using the Radius of the curve control points to round corners in a non-destructive manner.

GeoNodesExample_021 LoopAnimationEffector.blend
Blender 3.5+ (not tested in earlier versions)

Seamless looping animation with an effector (empty) that controls scale. With the correct color match at the beginning and at the end of the loop.

UPDATE:
GeoNodesExample_021 LoopAnimationEffector V2.blend
(with controls)
Added modifier controls for frame range (to match range frame count on the timeline), speed, instances size, size decay by distance

UPDATED VERSION with controls

GeoNodesExample_021 LoopAnimationEffector V2.blend

GeoNodesExample_022 TwistedBendedRotation.blend
Blender 3.6+

GeoNodesExample_023 LayeredNoiseStructure.blend

Blender 4.0+

GeoNodesExample_024 SineScaleCloner.blend

Blender 3.5+

GeoNodesExample_025 HelixCable.blend

Blender 3.4+