If I purchase a Salesforce account, can I do everything I can do with a normal account?
Yes, at the moment you can. We’re currently looking at fusing the two plans and making Salesforce a part of premium plans. Until that is official, you’re best purchasing the plan that is specifically catered to your needs (e.g. if you’re mainly looking to do Salesforce dev, purchase the Salesforce plan and vice versa).
Just to make sure: If I purchase a Salesforce account, does that include the Free plan or the Individual plan?