SendX.io - SendX (https://sendx.io) provides remarketing and retargeting tools for web businesses. You can use popups, landing pages, email, web push notification, automation workflows and FB / Google retargeting to drive more revenue.
Viral Loops - Viral Loops is a viral and referral marketing platform to launch ranking competitions, sweepstakes, pre-launch and referral programs.
Growth Hack World - Together We Rise
Best Referral Programs - A curated directory of startup referral programs
AppVirality - World's #1 referral marketing software that helps you design, manage, and optimize successful customer referral campaigns.
GrowSurf - Referral software for B2C, FinTech, and SaaS companies.