Plunk

useplunk.com

Open-source email platform: newsletters, automated and transactional emails.

Strengths

Easily create visuals, posts, posters and presentations from templates.

CRM to manage your contacts, sales and marketing.

SEO suite: keywords, competitors and site audits.

Schedule your posts across every social network.

Measure your website's traffic and visitor behavior.

Track your site's Google rankings: queries, clicks and indexing errors.