I run SaaS products (https://www.linksspy.com https://www.linksspy.com and http://www.terminretter.de http://www.terminretter.de) as profitable side projects.

I run SaaS products (https://www.linksspy.com https://www.linksspy.com and http://www.terminretter.de http://www.terminretter.de) as profitable side projects. I'm also working on a book on email marketing for SaaS products that details what I've learned from marketing my own products: http://saasemailmarketing.net http://saasemailmarketing.net