This is a problem with user content submitted sites. It's hard not to conflate the quality of the content (shaders) with the quality of the product (ShaderFrog). There are no default ShaderFrog shaders, they're all user created.
The more oddball shaders (my favorites) are the composed shaders, which are not eligible to be used as inputs to other composed shaders. Only the basic shaders, which are generally higher quality because they require more knowledge of how GLSL works, can be inputs to composed shaders.
This is a problem with user content submitted sites. It's hard not to conflate the quality of the content (shaders) with the quality of the product (ShaderFrog). There are no default ShaderFrog shaders, they're all user created.
The more oddball shaders (my favorites) are the composed shaders, which are not eligible to be used as inputs to other composed shaders. Only the basic shaders, which are generally higher quality because they require more knowledge of how GLSL works, can be inputs to composed shaders.