I am frequently using Cadcam Components' GW3D add-in. In particular, I am using:
 

• G3 blend surfaces
• G3 blend curves
• conic surfaces
• fence surfaces
• mirror curve

Unfortunately, Cadcam Components announced they will stop support for GW3D due to a change in policy by Dassault. For me, this means I either need to switch to another software, or I need to find alternative add-ins that can do the same in Solidworks. Does anyone know of suitable solutions?