MailerLite - Affordable Email Marketing Software. Get all features (Segmentation, Automation, A/B testing) for up to 1,000 subscribers & send unlimited emails for free!

Tuio.org - Tuio is a billing and payment application that allow daycare centers and pre-schools to centralize and manage all parent billing and payment in one place.

Revue - The easiest way to create and send a curated newsletter

Sawyer - Discover a wonder-filled world of kids classes, camps, events, and activities, right in your neighborhood

Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES

Yusp - Yusp is a next generation, real-time personalization engine having all product modules as defined by Gartner for various business models.