RafflePress - RafflePress is the best WordPress contest and giveaway plugin. Grow your email list, followers, and website traffic with viral giveaways in WordPress.
OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
UpViral - Referral marketing platform enables anyone in running effective and profitable viral marketing campaigns – in minutes.
Sumo - Free tools to grow your email list.
Tremendous - Tremendous is a customer and employee loyalty platform that allows companies to reward their customers for surveys promotions and referrals.
POPUPSMART - A no-code tool to increase e-commerce sales, build email lists and engage with your visitors in just 5-minutes.