Domain Flipping

https://domize.com/

Estibot.com and DNscoop.com are two very good domain appraisal tools.

Nameboy is not good.

http://www.worldatlas.com/geoquiz/thelist.htm

DNSalePrice.com is a free tool where you can quickly access comparable domain sales data (enter keyword, number of words, hyphens or not, etc. and it will show you other domains and their actual sales prices with matching criteria)