Carrd - Simple, responsive one-page site creator.

Poptin - Create engaging and high converting website pop ups and contact forms in minutes. With Poptin, you get access to a feature-packed conversion rate optimization toolkit that converts more website visitors into email subscribers, leads, and customers.

Landing Pages in MailChimp - Easy to build, custom landing pages for free

Sumo - Free tools to grow your email list.

Bumble - Bumble is a social network that allows you to feel empowered while you make those connections, whether you’re dating, looking for friends, or growing your professional network. One first move on Bumble could change your life.

Little Widgets - HTML, CSS Framework with beautifully designed website widgets, popups, and forms.