OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
Proof - Website conversion rate optimization and visitor monitoring
Sumo - Free tools to grow your email list.
Picreel - Recover abandoning visitors and turn them into customers
POPUPSMART - A no-code tool to increase e-commerce sales, build email lists and engage with your visitors in just 5-minutes.
GetSiteControl - Website popup builder & email marketing suite for ecommerce