Unity Ads - Unity Ads allows to supplement the existing revenue strategy by allowing to monetize thr entire player base.
Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.
MoPub - MoPub is a mobile monetization platform that helps publishers drive more revenue from advertising and mobile transactions.
Devhints - TL;DR for developer documentation
Appodeal - Appodeal is a supply-side platform for mobile apps, that serves and protects publishers rather than advertisers.
Meta Tag Generator - Generate HTML code optimal for SEO, social media, & mobile.