Add Curve Extra Objects

This add-on groups many curve object creation add-ons into a single one.

Activation

Located in the 3D Viewport ‣ Add ‣ Curve.

Included curve object add-ons:

Curve Profiles (Curveaceous Galore) by Jimmy Hazevoet, testscreenings: Arc, Arrow, Cogwheel, Cycloid, Flower, Helix, Noise, N-sided, Profile, Rectangle, Splat and Star types.
Braid by Jared Forsyth: Adds a Braided Knot type curve.
Celtic Knot by Adam Newgas: Wrap a mesh object in a knotted curve.
Curly Curve by Cmomoney: Adds a "Flourish" type curve.
Simple Curve by Vladimir Spivak (cwolf3d): Point, Line, Distance, Angle, Ellipse, Arc, Sector, Segment, Rectangle, Rhombus, Polygon, Polygon ab, Trapezoid curve types.
Spirals by Alejandro Omar Chocano Vasquez: Archimedean, Logarithmic, Spherical, Torus curve types.
SpiroFit, BounceSpline and Catenary by Antonio Osprite, Liero, Atom, Jimmy Hazevoet: Spiral fit curve to mesh, Bounce Spline inside a mesh, Catenary curve between two mesh objects.
Torus Knots, by Marius Giurgi (DolphinDream), testscreenings: Adds many types of (torus) knots including ten presets.
Bevel/Taper Curve, by Cmomoney: Adds bevel and/or taper curve to active curve.
Surface Objects, by Folkert de Vries: Adds a NURBS surface Plane, Cone, Star, Wedge.

Reference