Launchlist is a website built to check websites that you’re working on against a series of questions pre- launch to make sure you haven’t forgotten anything. This is the perfect tool for freelancers.
I know that on my next web project I’ll be using this. Although you really should send someone the url to your project link and have them check things off. That way you’re not checking things off that you’ll “do later” or “will get to eventually”. If you feel the need to add more questions, you can customize that at the bottom.