This is a list of the sites operated by third parties dedicated to documenting the RLSHs but not directly associated with them. These tend to be sites that provide overviews or are geared towards a wider audience.
An independent wiki devoted to chronicling superheroes in general, there is a section that lists the RLSH out there. Visit it here. However, this site hasn't been updated since 2012 and so much of the information is no longer accurate.
Heroes in the Night
Originally a blog documenting various RLSH by freelance writer Tea Krulos in Milwaukee, in October of 2013, Tea's book 'Heroes in the Night: Inside the Real Life Superhero Movement' was published by Chicago Review Press and became available to purchase all over the world. Visit the website here.
Real Life Superheroes Index
This site is a fan site about superheroes in general and has a small but dated subsection devoted to just RLSH. (Site removed because it now redirects to malware)