Crunchbase - Crunchbase is a platform for discovering industry trends, investments, and news about companies around the world.
Adriel - A platform to monitor, control, and optimize your paid advertising from 600+ ad channels under a single dashboard.
CB Insights - CB Insights is a company database for the venture capital and corporate development community.
Adalyz - Compare Your Google Adwords Vs Facebook Ads Vs Instagram Ads and decide where to put your money. Powerful analytics and reporting for your ad campaigns.
Tracxn - data on companies
PPC Gear - Instantly find where you lose money in Google Ads