Effects Database is an online encyclopedia of guitar effects pedals. It's mostly a one-man labor-of-love that was started in 2003 as a site about filter effects (also in modular format). It evolved into a site about all types of guitar effects, focusing on pedals. There has since been a big boom in brands and interest in boutique pedals (especially since 2008). The site currently lists more than 26000 pedals by more than 4000 brands, making it the biggest resource about guitar pedals.