I was on this forum years ago as "sgfcchamber" however I cannot remember the password for the account, nor the email address used when I signed up, so alas I have to start a new account.
Anyway, I created a substrate calculator way back then and published it under it's own domain name. I let the domain expire so it vanished from the web. This time I've uploaded the site I created to "weebly" which has free web hosting. This way it will remain on the web "forever" because me forgetting to renew hosting or a domain name can't now inadvertently result in it being taken down.