HotBits is described as 'Internet resource that brings genuine random numbers, generated by a process fundamentally governed by the inherent uncertainty in the quantum mechanical laws of nature, directly to your computer in a variety of forms'. There are three alternatives to HotBits, not only websites but also apps for Self-Hosted solutions. The best alternative is RANDOM.ORG, which is free. Other great sites and apps similar to HotBits are Random-Required (Free, Open Source) and Faker (Free, Open Source).
RANDOM.ORG offers true random numbers to anyone on the Internet. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs. People use RANDOM.
Faker is a PHP library that generates fake data for you. Whether you need to bootstrap your database, create good-looking XML documents, fill-in your persistence to stress test it, or anonymize data taken from a production service, Faker is for you.