Most of my clients don't own the necessary software to make changes and alterations to the designs I create. The shortlist of software I use is Adobe Photoshop, Adobe Illustrator, and InDesign. If you do own the software needed to make updates and changes I'm happy to create template files. These typically contained locked layers for the layout aspects and leave the text and images editable. For those with more confidence in the software, they're able to unlock the other layers.