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…
TagSpaces - TagSpaces is an open source platform for personal data management. With TagSpaces you can manage and organize the files on your laptop, tablet or smart phone.
CopyQ - CopyQ : Clipboard Manager with Advanced Features.
allTags - allTags is a free, tag based file management application.
Clipy - Clipy is a clipboard extension for macOS.
Elyse - The free version allows up to 30 tags.