Here is an awesome set of vector mockups with practically all Apple devices. The free version of this bundle icludes mockups for iMac, MacBook Pro and MacBook Air. The remaining mockups are available in the premium version. Everything is well organized in a layered PSD file with smart objects. Every device has additional effects that can be turned on or off (glare, reflection, shadows). The freebies is free for personal or commercial use and you can get it by subscribing on website.