OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
Hunter - Find all the email addresses related to a domain
Freebiebucket - Curated free tools & resources for makers 🛠
Albacross - The world's first free B2B Lead Generation Network. Albacross help companies master their B2B digital marketing with Lead Generation and targeted marketing
Yeps! - All-in-one bar for your website
Upscribe - Embeddable lead generation forms for Medium