Pedals start out simply as some overdrive, modulation, delay, volume, wah and then specialist pedals both in Analog and Digital forms. These come in several forms single, dual, treble, quadruple and multi FX. Sales tend to focus mainly on single and multiple ones. I do not cover modelling pedals here that is covered under that section.
The section here is looking more at the pedals that are seen as niche or different. I am not trying to duplicate the sites from artists or from the stores. I may give links and will you give Editor picks.