As the name sais about it, SuperCopier is a super app that acts as a replacement for dialogs when you want to copy some files. It is easy to use, it can be controlled in many ways and it is open source. If you want to bring some new features to it, you can do it. It is also a free solution. With this program you can play and pause any transfer, you can limit speed and manage every error that occurs.
It can be used for Windows and for Mac and it doesn’t need many resources to work properly.