CopyQ - CopyQ : Clipboard Manager with Advanced Features.
Ditto - Easy to use interface; Search and paste previous copy entries; Keep multiple computer's clipboards in sync; Data is encrypted when sent over the network; Accessed from tray icon or global hot key; Select entry by double click, enter key or drag drop…
Clipy - Clipy is a clipboard extension for macOS.
ClipX - ClipX is a tiny clipboard history manager. It is sweet, it is free, use it.
RecentX - RecentX is an innovative launcher that gives you instant access to your files, folders, programs...
Yoink - Yoink is a website that makes it easier to drag and drop images and text from one screen to another. It's a straightforward site with help along the way if you aren't sure about dragging and how to place your content.