OpenNewsletter is a free & open-source newsletter/mailing-list manager developed in php Self Exile. It does not require a database. You just need to put it in your website and...
Not Applicable 
$ 8.95
ForaStat is a free tool which helps analyse websites and estimate valuation including such as Search Engine Reports, Traffic Reports, Social Engagement, Safety, Host Information, Domain WHOIS, Page Speed and much more.