Designers, let's talk terminology.
Outside of full-time employment there's a bewildering array of banners we work under and I think we're confusing ourselves with them.
Bobby works from home. His clients find him through Dribbble or via word of mouth. He charges by hour, day or by project; he doesn't necessarily work exclusively on one client's work at a time though.
Karen is a 'freelancer'. She goes into client offices a week or a month at a time, charges by a daily rate (wouldn't a project rate seem weird in this circumstance?). Her clients expect her to have her own equipment but work from their office with their team.