Wiki Reverse - See what websites are linking to Wikipedia pages
Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...
Six Degrees of Wikipedia - Find the shortest path between two subjects
Fandom - The entertainment site where fans come first.
Pathica - Find a path to connect with anyone on Instagram.
Investopedia - Investopedia has a lot of information to share with business mind people.