Trapcode Form has a lot of presets included, but as far as I know, there is no way to preview all at once, instead you have to drag each one onto a new layer in order to see what it looks like. I've created a set of thumbnails here to act as a reference guide.

All of the presets are fully editable and are useful for setting up quick particle systems to tweak or to look at features and options that you might not have used.

Note that some require layer maps or audio tracks to reference. tf2_Dissolve_HD for example, requires an image precomposed and placed in the same composition as the form layer. The layer needs to referenced on the Form layer under Layer Maps/Color and Alpha/Layer (be sure to turn the visibility switch off for the precomposed layer).

Form 2.0 Presets

Form 2.0 Audio Presets

Form Presets (All Versions)