OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Freebiebucket - Curated free tools & resources for makers 🛠
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
GetSiteControl - Website popup builder & email marketing suite for ecommerce
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.