There are many free and paid 3D modeling software available online, each with its own strengths and weaknesses. Some of the most popular free options include Blender, SketchUp, Tinkercad, and Fusion 360. These software offer a range of tools and functions for creating and editing 3D models, as well as exporting them to different formats. However, they may also have some limitations, such as less control over the quality of the output, fewer customization options, or less support and documentation. Paid options, on the other hand, may offer more features, better performance, and more professional results, but they also come with a price tag. Some of the most popular paid options include SolidWorks, Rhino, Maya, and ZBrush. These software are often used by industry professionals and experts, and they can handle complex and detailed 3D modeling tasks. However, they may also require more training, more hardware resources, and more maintenance.