Here is a link for EstiBot.com it is a great source to appraise your domains.
I just would like to point out that automated appraisals are worthless most of the time IMO.
You must learn what makes a good name and if it has the potential to sell to a business or brand.
You might want to join to NamePros.com and read more about this, Plenty of valuable info in there.
All the best!
Sorry, colleague, but I liked a similar service on Godaddy more. I checked the last two own domains I sold, Estibot wrote that they have no value.