If you’ve found a graphic that meets your needs and demand, but it’s a CDR format, and you don’t have CorelDraw, then you can edit it using other available programs.
One of the most common software that allows you to do that is Inkscape. It is a free vector graphics creation and editing program which runs on Windows, Linux, and Mac OS X.
In the alternative, you can convert the CDR file into another format (e.g., PDF) and then open it using another compatible software.