SendX.io - SendX (https://sendx.io) provides remarketing and retargeting tools for web businesses. You can use popups, landing pages, email, web push notification, automation workflows and FB / Google retargeting to drive more revenue.
Question2Answer - A Q&A site helps an online community to share knowledge.
Nova Inbox - Personalize emails in seconds, right from your inbox
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
Mailblast - Email marketing on a budget using Amazon SES
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.