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…
CopyQ - CopyQ : Clipboard Manager with Advanced Features.
Clipman - Clipman is a clipboard manager for Xfce.
CLCL - CLCL is clipboard caching utility. * All clipboard formats are supported.
ClipIt - ClipIt is a lightweight, fully featured GTK+ clipboard manager. It was forked from ...
ClipX - ClipX is a tiny clipboard history manager. It is sweet, it is free, use it.