Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Askalot - Askalot is a next generation CQA (Community Question and Answer) system.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.