Does anyone know whether there exists a website or document that has such an overview? Preferably one that is regularly updated?

So it would for example have a list of bitcoin and alt-coin exchanges, of alternative platforms/protocols, of online and offline wallets, and of all other types of companies, technologies etc in the cryptocurrency ecosystem.

Or do you know of documents or websites that have an overview of one or more of these categories (e.g. I know there is one that lists all the different alt-coins)?

Thanks.